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Salnax said:
shavenferret said:

the big 3

Who would that be? Christianity, Islam, and Hinduism?

Correct 

Rank Religion Estimated Followers % of World Population
1 Christianity ~2.4 billion ~31%
2 Islam ~2.0 billion ~25%
3 Hinduism ~1.2 billion ~15%
4 Buddhism ~500 million ~6%
5 Folk/Traditional Religions ~400 million ~5%
6 Sikhism ~26 million <1%
7 Judaism ~15 million <0.2%
8 Baháʼí Faith ~8 million <0.1%
9 Jainism ~5 million <0.1%
10 Shinto (Japan) ~4 million (practicing) <0.1%