Christianity
Estimated number of followers worldwide
≈ 2.4 bn
Islam
Estimated number of followers worldwide
≈ 2.2 bn
Unaffiliated
Estimated number of followers worldwide
≈ 1.9 bn
Hinduism
Estimated number of followers worldwide
≈ 1.2 bn
Buddhism
Estimated number of followers worldwide
≈ 328.1 m
Other religions
Estimated number of followers worldwide
≈ 177.8 m
Judaism
Estimated number of followers worldwide
≈ 15.5 m
Estimated figures based on national population data and reported religious affiliation shares. Values are approximate and intended for comparative analysis, not exact counts.