Ranked by Number of Adherents (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 16.. Cao Dai: 4 million 17.. Zoroastrianism: 2.6 million 18.. Tenrikyo: 2 million 19.. Neo-Paganism: 1 million 20.. Unitarian-Universalism: 800 thousand 21.. Rastafarianism: 600 thousand 22.. Scientology: 500 thousand Much more... http://www.adherents.com/Religions_By_Adherents.html
top of page