Cities, Migration, and the Moving Mission Field

The missionary map is moving.

Not metaphorically.

People themselves are moving.

International migration, internal migration, refugee displacement, education, labor markets, marriage, and urbanization continually rearrange the proximity of religious communities. A population that once seemed geographically distant may now live on the same street as a church that spent decades supporting missionaries overseas.

This movement creates extraordinary opportunities.

It also exposes a misconception at the heart of missionary geography:

physical proximity is not the same as relational access.

304 Million International Migrants

The United Nations’ International Migrant Stock 2024 estimates that 304 million people were international migrants in 2024, equivalent to about 3.7 percent of the global population. The number had nearly doubled since 1990. Europe hosted approximately 94 million international migrants, Northern America 61 million, and Northern Africa and Western Asia 54 million.¹

The 3.7 percent share may look small beside the rhetoric of a “world on the move.”

In absolute terms, 304 million people is larger than the population of almost every country on earth.

And international migration is only one category of mobility.

Hundreds of millions more move internally from rural areas to cities, between regions, or through temporary labor systems without crossing international borders.

Missionary geography therefore cannot assume stable populations living permanently inside traditional homelands.

What Counts as a Migrant? UN migrant-stock data primarily classify international migrants through country of birth or, where necessary, citizenship. The category includes people whose experiences differ dramatically:

• permanent immigrants;
• temporary workers;
• international students;
• refugees;
• spouses;
• children who moved young;
• retirees;
• professionals.

The word migrant should therefore not become one missionary identity.

A Syrian refugee, Korean doctoral student, Filipino nurse, Nigerian entrepreneur, and retired British resident in Spain are all international migrants in statistical terms.

Their vulnerabilities, social networks, and religious relationships are completely different.

Mission to migrants requires the same contextual precision demanded everywhere else.

The Urban Transformation. Migration interacts with a larger process: urbanization.

The United Nations’ World Urbanization Prospects 2025 uses a harmonized Degree of Urbanization framework that distinguishes cities, towns and semi-dense areas, and rural areas. Under that framework, approximately 45 percent of humanity lived in cities, 36 percent in towns and semi-dense areas, and 19 percent in rural areas in 2025.²

This classification differs from older national urban definitions and should not be mixed casually with earlier urbanization percentages.

The missionary significance is obvious.

Most human beings now live either in cities or in settlements more densely connected than traditional rural mission maps suggest.

Urbanization concentrates difference.

The City as Missionary Intersection

A large city may contain within a few square kilometers:

• historic churches;
• secular professionals;
• international students;
• mosques;
• migrant congregations;
• Hindu temples;
• Buddhist centers;
• refugees;
• minority languages;
• expatriate professionals;
• low-income internal migrants.

The city therefore collapses physical distance while preserving social boundaries.

A Christian can ride the same train each morning as members of five religious communities and never enter any of their relational worlds.

Urban mission requires mapping networks, not merely neighborhoods.

The Neighborhood Fallacy. Churches often assume that people living nearby are naturally accessible.

Consider a congregation in a European city surrounded by Turkish-speaking Muslim families.

The church building is close.

The congregation may worship entirely in German, consist mostly of ethnic Germans, socialize through networks that rarely include Turkish families, and host programs whose cultural signals feel foreign to the surrounding community.

Geographic access is high.

Relational and cultural access may remain low.

This is why counting churches per capita cannot measure urban gospel access adequately.

Internal Migration. Missionary discussion often focuses on international migrants because national borders are visible.

Internal migration can reshape Christian access even more profoundly.

China’s rapid urbanization moved enormous populations from rural regions into cities. India’s internal migration links states and language communities. African megacities attract people from several ethnic and religious backgrounds. Latin American urbanization reshaped societies across the twentieth century.

Internal migrants may encounter Christianity differently in cities than in home communities.

Traditional village authority weakens.

New friendships emerge.

Workplaces mix populations.

At the same time, migrants may cluster by language or region and recreate strong social networks.

Urbanization therefore creates both permeability and segregation.

Diaspora Mission

Missiology commonly describes several relationships between diaspora and mission, reflecting a wider scholarly recognition that migration has become a major force in the making and remaking of global Christianity.³

Mission to diaspora

Churches serve and evangelize migrant populations.

Mission through diaspora

Christian migrants become witnesses within their new environments.

Mission beyond diaspora

Diaspora relationships create pathways toward wider populations or homelands.

The framework is useful if it does not turn migrants into instruments.

The first obligation of a Christian encountering a migrant neighbor is not to extract strategic value.

It is to love the neighbor.

Hospitality. Hospitality is among the simplest and most powerful forms of diaspora engagement.

Migrants frequently navigate:

• unfamiliar institutions;
• language difficulty;
• loneliness;
• housing;
• bureaucracy;
• cultural uncertainty.

Churches can help through:

• meals;
• friendship;
• practical support;
• language conversation;
• community.

These acts can create relational access Christian media cannot produce.

But hospitality becomes manipulative if assistance is implicitly conditional upon religious interest.

The migrant should remain welcome even after saying no to Christianity.

The integrity of the relationship is itself part of Christian witness.

Refugees

Refugees require particular ethical care because displacement creates acute vulnerability.

War, persecution, political repression, or state collapse may have cost people:

• homes;
• family members;
• documentation;
• livelihood;
• safety.

Christian organizations often provide essential humanitarian assistance.

The asymmetry of power is obvious.

A person dependent on food, accommodation, medical care, or legal support may feel pressure to please the provider even when no explicit coercion exists.

Missionary ethics therefore requires clear separation between humanitarian entitlement and religious response.

The refugee is not a missionary opportunity first.

The refugee is a neighbor in crisis.

Conversion in Refugee Contexts. This ethical caution does not mean refugees cannot genuinely become Christian.

Displacement often produces deep religious questioning. People encounter new communities. Existing identities can be reevaluated. Some Muslim refugees in Europe and elsewhere have joined Christian churches and been baptized.

The church should take such conversion seriously enough not to romanticize it.

Conversion can affect asylum claims, family relationships, and community safety. Churches need careful discipleship rather than counting baptisms as evidence of a refugee-revival narrative.

The new believer needs a church after the public story ends.

International Students. International students form another large mobile population with distinctive missionary significance.

Students often spend several formative years outside their home society. They may possess greater freedom from family expectations, encounter new religious ideas, and build friendships across cultures.

Churches can offer:

• hospitality;
• mentoring;
• conversation;
• Bible study;
• community.

International-student ministry has sometimes been justified strategically because students may later return as influential professionals.

That possibility is real.

It should not determine the student’s value.

The student is worth knowing even if he never becomes a Christian, never returns home, or never enters a position of influence.

Labor Migration and the Gulf

The Gulf illustrates a different mobility system.

Millions of workers from South Asia, Southeast Asia, Africa, and elsewhere live in Gulf states under temporary labor arrangements. Christians among them form expatriate churches; Muslims, Hindus, Buddhists, and others participate in the same labor markets.

This creates intense religious proximity alongside sharp citizenship and class hierarchies.

A Filipino Christian nurse may work beside Muslim colleagues from several countries.

An Indian Christian laborer may worship in an expatriate congregation while having almost no social connection with citizens.

The missionary opportunities are real.

So are labor vulnerabilities.

Churches should not celebrate global Christian mobility without also caring about exploitation, worker rights, loneliness, and family separation.

Filipino Migration and Christian Presence. Filipino migration provides one of the strongest examples of Christian presence moving through labor networks.

Catholic and evangelical Filipino communities exist across Asia, the Gulf, Europe, and North America. Seafarers live for long periods in international crews. Nurses and caregivers form close relationships with patients and coworkers. Domestic workers live inside households.

Some Christian migrants understand their work explicitly through vocation and witness.

Others do not.

The category missionary should therefore not be assigned automatically.

Christian presence becomes missionary when believers intentionally bear witness and participate in disciple-making across meaningful boundaries.

African Churches in Europe. African-led churches have become highly visible in several European cities.

Their existence complicates the story of European secularization. Christianity is declining in some historic populations while being renewed or reintroduced through migration.

The phenomenon raises difficult contextual questions.

A Nigerian-founded church in London may thrive among Nigerians.

Can it also reach secular British neighbors?

A Congolese congregation in Brussels may worship with extraordinary vitality.

Can its second generation remain Christian while becoming culturally Belgian?

Diaspora churches face their own contextualization task.

They can become missionary bridges or culturally enclosed enclaves.

Neither outcome should be assumed.

Reverse Mission Reconsidered

This is why “reverse mission” remains a limited concept.

It names the striking fact that Christians from former mission fields now establish churches in former sending countries.

But mission does not automatically occur because the direction has reversed.

A Ghanaian church in Amsterdam serving almost entirely Ghanaian believers may be a healthy diaspora church without being primarily a mission to Dutch society.

Mission requires boundary crossing, not merely changed latitude.

Diaspora and Homeland. Migrants also maintain relationships with home communities through:

• remittances;
• messaging;
• social media;
• travel;
• family networks.

A new Christian in diaspora can therefore carry Christian influence home long before permanent return.

This creates both opportunity and risk.

Religious change revealed through family messaging can create conflict.

Digital conversations can be monitored.

Missionaries should not assume diaspora converts can safely become bridges to their home communities.

The convert’s own judgment should carry substantial weight.

Second Generations. Diaspora changes over generations.

Children may speak the parents’ language imperfectly.

Marriage patterns broaden.

Identity becomes hybrid.

A church built around first-generation language and culture can struggle to retain the second generation.

Missionary strategy therefore needs to distinguish:

• first-generation ethnic ministry;
• second-generation discipleship;
• wider cross-cultural mission.

The same congregation may need all three.

Cities and Class

Urban mission is also shaped by class.

A megacity contains wealthy professionals, middle-class families, informal settlements, migrant laborers, students, and homeless populations.

Churches can be physically close and socially separated by income.

A professional-class evangelical congregation may possess almost no relationships with low-income migrants living nearby.

Missionary social distance therefore includes class as well as ethnicity and religion.

This is one reason the phrase “urban mission” is too broad to function as a strategy without further definition.

Megachurches and Invisible Populations. Large urban churches can create another statistical illusion.

A city may contain tens of thousands of Christians attending prominent congregations.

Missionaries then assume the city is well served.

But the churches may draw mainly from certain:

• classes;
• ethnicities;
• language groups;
• neighborhoods.

Other populations remain almost untouched.

The national-average problem becomes a city-average problem.

Mission research needs network-level curiosity even where Christianity is institutionally strong.

Digital Cities. Urban populations also inhabit digital networks that cross geography completely.

A university student may have more social contact with a gaming community across three countries than with neighbors in the same apartment building.

Religious exploration likewise occurs online.

Missionary social geography therefore increasingly includes platforms, interest groups, and digital subcultures.

This does not make physical place irrelevant.

People still live somewhere, need embodied community, and participate in institutions.

The digital layer adds another network to the map.

Migration and the People-Group Model. Migration challenges static people-group classification.

A Somali population in Somalia and Somali diaspora communities in Minneapolis, London, Stockholm, Nairobi, and Cologne share language and heritage while developing different social environments.

Second generations may speak different languages.

Intermarriage changes boundaries.

Legal and religious freedom differs.

Should all be one missionary people group?

Ethnically, perhaps.

In terms of access, clearly not.

This is why place remains essential alongside people.

The Moving Mission Field

The phrase mission field once suggested distant stable geography.

The contemporary missionary environment is mobile.

The people we hope to serve may move.

The missionary may move.

A church’s neighborhood may transform in ten years.

A refugee crisis can create a new diaspora overnight.

A university can become one of the most religiously diverse environments in the country.

This volatility makes one-time mapping insufficient.

Mission strategy must be periodically revised.

The Ethical Priority of Agency. Finally, migrants should participate in defining mission to migrants.

Churches can easily design programs for diaspora communities without involving their leaders. Refugees can be discussed as fields. Migrant Christians can be treated as volunteer translators rather than theological partners.

Locally rooted leadership matters here as everywhere else.

A Syrian Christian may understand Syrian refugee communities more deeply than a German mission agency.

A Turkish-background believer may interpret family dynamics outsiders miss.

A second-generation Christian can help churches understand hybrid identity.

The missionary church should learn from the people whose movement created the new context.

The Paradox of Proximity

Cities and migration therefore produce one of the book’s central paradoxes:

physical distance can collapse while social distance remains.

The migrant moves next door.

The church still may not know the migrant.

A Bible exists in the national language.

The newcomer may speak another language at home.

Religious freedom increases.

Family pressure remains.

A Christian congregation is nearby.

Its culture may feel inaccessible.

The moving mission field therefore confirms the need for a multidimensional account of gospel access.

Part III began with a warning against false precision. Unreached is useful because it forces attention below the level of nations and denominations. It becomes misleading when a research threshold is treated as if it were a complete description of a community. The same lesson has recurred in every chapter. A population is never reducible to one percentage. Geography, language, family, law, religious tradition, class, migration, historical memory, and local Christian presence interact. The missionary question is not merely whether Christianity exists somewhere nearby. It is whether meaningful Christian witness can actually cross the boundaries that organize a person’s social world.

The chapters have also shown that distance has more than one form. Some communities are geographically distant from strong Christian populations. Others live beside churches but remain relationally distant. Some have extensive Christian media but little trusted personal contact. Some can encounter Christian teaching in a national language but not in the language that carries family life, prayer, memory, or identity. Some live under legal systems that restrict public religious change. Others possess legal freedom but face powerful family, caste, ethnic, or reputational costs. Still others live in post-Christian societies where churches are numerous and information is abundant, yet Christian belief has lost plausibility or institutional credibility.

This prevents two opposite mistakes. The first is to flatten the unfinished mission into a single global count. Counts matter. They direct attention, reveal concentration, and make neglected populations visible. But a number of unreached groups cannot by itself describe the depth or type of access problem within each group. The second mistake is to react against imperfect metrics by abandoning prioritization altogether. If one community possesses many churches, multiple Bible translations, extensive Christian media, and broad relational contact while another possesses almost none of these, the difference is morally and strategically relevant. Equal dignity does not require the church to pretend that access is equally distributed.

Religious labels have proved equally limited. The phrase Muslim world hides Arabic and non-Arabic societies, Sunni and Shi’a histories, Sufi and reformist traditions, secularized identities, migrant contexts, and radically different political environments. Hindu does not explain caste, language, regional tradition, family structure, or the long history of Indian Christianity. Buddhist, folk-religious, and unaffiliated can each conceal practices and beliefs that do not fit a neat institutional category. Post-Christian identifies a historical trajectory rather than simply a low church-attendance rate. Mission begins with accurate description because people should be encountered as communities and persons rather than as examples of an abstract religious type.

Language provides one of the clearest tests of this principle. Bible translation has achieved extraordinary measurable progress, yet the presence of a translated text does not settle the question of Scripture engagement. Oral communities, sign-language communities, multilingual populations, literacy differences, revision needs, digital formats, and local ownership all affect whether Scripture is genuinely usable. Translation can complete a particular task. It does not complete discipleship. The same distinction applies elsewhere: an evangelistic campaign can finish, a church can be planted, a missionary can hand over leadership, and a people-group classification can change, while the church’s wider responsibility continues.

Cities and migration then destabilize the map itself. People once described as living in distant mission fields now form diasporas in London, Cologne, Toronto, Dubai, Seoul, Nairobi, and countless other cities. Christian migrants carry churches into new regions. Refugees and international students enter unfamiliar social networks. Second generations develop identities different from those of their parents. Yet physical proximity does not automatically become relational access. A church and a low-access community can occupy the same postal code while remaining socially invisible to one another.

The result is a more demanding but more realistic missionary geography. The unfinished mission cannot be represented adequately by one belt of latitude, one religious bloc, one list of countries, or one people-group threshold. It is better understood as a pattern of unequal access across overlapping human worlds. The map must remain dynamic because the worlds themselves move.

That conclusion creates the question for Part IV. If Christianity is globally distributed, Scripture is more widely available than at any previous point in history, communication technology can cross borders almost instantly, and the worldwide church possesses enormous human and institutional resources, why do severe access disparities persist? Description is no longer enough. The analysis must become causal.

The next Part therefore turns from where the gaps are to why the gaps remain: how resources are allocated, how political and social barriers operate, how cultural distance slows understanding, how institutions develop inertia, how calling and strategy interact, how short timelines distort long work, and how missionary power itself can reproduce the very distances it intends to cross.

Footnotes

1. United Nations Department of Economic and Social Affairs, Population Division, International Migrant Stock 2024: Key Facts and Figures (2025): 304 million international migrants in 2024, 3.7 percent of world population; Europe hosted 94 million, Northern America 61 million, and Northern Africa and Western Asia 54 million. ↩

2. United Nations Department of Economic and Social Affairs, Population Division, World Urbanization Prospects 2025, using the harmonized Degree of Urbanization framework: approximately 45 percent of humanity in cities, 36 percent in towns and semi-dense areas, and 19 percent in rural areas in 2025. ↩

3. Jehu J. Hanciles, Migration and the Making of Global Christianity (Eerdmans, 2021), for the historical and missiological significance of migration in global Christianity. ↩