Statistics of the world's religions are only very rough approximations. Aside from Christianity, few religions, if any, attempt to keep statistical records; and even Protestants and Catholics employ different methods of counting members.

Rank Religion Members 1. Christianity 2.3 billion 2. Islam 1.8 billion 3. Unaffiliated 1.2 billion 4. Hinduism 1.1 billion 5. Buddhism 500 million 6. Folk religions 400 million 7. Other religions 100 million 8. Judaism 10 million

NOTE: Numbers from 2015 via the Pew Research Center

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