Religion Population 2025. If current trends continue christians will remain the largest religious group by 2060 (32 percent of the world's population), but islam will experience the fastest growth, with an expected. The first two columns offer population projections based on un demographics from 1990 or 2025, respectively.
World population by religion | as of 2020, christianity was the worldโs largest religion, followed by islam, hinduism, and buddhism. The decline of religion in the west has caused people to ask: