Islam: The Second Largest World Religion...and Growing

'Islam will become the most popular world religion sometime in the mid-21st century.'

-Religious Tolerance

(Sizes shown are approximate estimates, and are here mainly for the purpose of ordering the groups, not providing a definitive number. This list is sociological/statistical in perspective.)

1. Christianity: 2.1 billion
2. Islam: 1.3 billion
3. Secular/Nonreligious/Agnostic/Atheist: 1.1 billion
4. Hinduism: 900 million
5. Chinese traditional religion: 394 million
6. Buddhism: 376 million
7. primal-indigenous: 300 million
8. African Traditional & Diasporic: 100 million
9. Sikhism: 23 million
10. Juche: 19 million
11. Spiritism: 15 million
12. Judaism: 14 million
13. Baha'i: 7 million
14. Jainism: 4.2 million
15. Shinto: 4 million
16. Cao Dai: 4 million
18. Zoroastrianism: 2.6 million
19. Tenrikyo: 2 million
20.Neo-Paganism: 1 million
21. Unitarian-Universalism: 800 thousand
22. Rastafarianism: 600 thousand
23. Scientology: 500 thousand


Christianity is currently the largest religion in the world. It is followed by about 33% of all people -- a percentage that has remained constant since the days of Prophet Mohammad(PBUH).

While Christianity is still growing, if current trends continue, Islam will become the most popular world religion sometime in the mid-21st century.

Reverts to Islam! Islam sweeps through the west but why?

Part 1

Part 2