Demography of Religion

Demography of religion is the scientific study of populations of religious groups and population characteristics that influence their size. Populations can change in size via fertility (births), mortality (deaths), and migration. Because individual religious identity is not a fixed characteristic, religious switching (change in self-identity) is another dynamic of religion population change. Characteristics that may indirectly influence population change include levels of educational attainment, religious commitment levels, and patterns of household formation.

Pew Research Center is a leading producer of research on global demography of religion. This entry summarizes key findings from the center’s demography reports on the size and characteristics of major religious groups as well as projections for how the global religious landscape is expected to change in the future.

Population of Major Religious Groups

Christians, ...

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