Major Religions of the World

Ranked by Number of Adherents
from adherents.com
(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 billion
2. Islam: 1.3 billion
3. Hinduism: 900 million
4. Secular/Nonreligious/Agnostic/Atheist: 850 million
5. Buddhism: 360 million
6. Chinese traditional religion (Confuscionism): 225 million
7. Primal-indigenous: 150 million
8. African Traditional & Diasporic: 95 million
9. Sikhism: 23 million
10. Juche: 19 million
11. Spiritism: 14 million
12. Judaism: 14 million
13. Baha'i: 6 million
14. Jainism: 4 million
15. Shinto: 4 million
16. Cao Dai: 3 million
17. Tenrikyo: 2.4 million
18. Neo-Paganism: 1 million
19. Unitarian-Universalism: 800 thousand
20. Rastafarianism: 700 thousand
21. Scientology: 600 thousand
22. Zoroastrianism: 150 thousand

The adherent counts presented in the list above are estimates of the number of people who have at least a minimal level of self-identification as adherents of the religion. Levels of participation vary within all groups. These numbers tend toward the high end of reasonable worldwide estimates. Valid arguments can be made for different figures, but if the same criteria are used for all groups, the relative order should be the same. Further details and sources are available below and in the Adherents.com main database.