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Earlier estimates for numbers of Muslims were 1 to 1.3 billion, but high birth rates in Muslim countries continue to make Islam the fastest growing religion in the world.
Sunni and Shia are the two major denominations of Islam. About 85% of the world's Muslims are Sunni, and the remaining 15% are Shia (also referred to as Shiite). If one accepts the total number of Muslims as 1.5 billion, then there are indeed more Sunni Muslims (1.3 billion) than Catholics.
Here are the major world religions (source Adherents.com):
Rank | % | ||
1 | Christianity | 2.1 billion | 33% |
2 | Islam | 1.5 billion | 21% |
3 | Secular/Nonreligious/Agnostic/Atheist | 1.1 billion | 16% |
4 | Hinduism | 900 million | 14% |
5 | Chinese traditional (Confucianism, Taoism) | 394 million | 6% |
6 | Buddhism | 376 million | 6% |