Christianity
2 Billion

Islam
1.3 Billion

Hinduism
900 Million

Secular, Nonreligious, Agnostic, and Atheist
850 Million

Buddhism
360 Million

Chinese Traditional
225 Million

Primal and Indigenous
190 Million

Sikhism
23 Million

Yoruba
20 Million

Juche
19 Million

Spiritism
14 Million

Judaism
14 Million

Baha'I
6 Million

Jainism
4 Million

Shinto
4 Million

Cao Dai
3 Million

Tenrikyo
2.4 Million

Neo-Paganism
1 Million

Unitarian Universalism
800 Thousand

Scientology
750 Thousand

Rastafarianism
700 Thousand

Zoroastrianism
150 Thousand