| Christianity | 2.3 | Roman Province of Judea |
| Islam | 1.8 | Arabian Peninsula |
| Secular*[nonreligious, agnostic, atheist] | 1.2 | Worldwide |
| Hinduism | 1.15 | Indian subcontinent |
| Buddhism | 0.52 | Indian subcontinent |
| Chinese traditional religion*[Confucianism, Taoism] | 0.39 | China |
| Ethnic religions excluding some in separate categories | 0.3 | Varied |
| African traditional religions | 0.1 | Africa |
| Sikhism | 0.03 | Indian subcontinent |
| Spiritism | 0.015 | France |
| Judaism | 0.014 | Ancient Israel |
| Baháʼí | 0.007 | Persia (Iran) |
| Jainism | 0.004 | Indian subcontinent |
| Shinto | 0.004 | Japan |
| Cao Dai | 0.004 | Vietnam |
| Zoroastrianism | 0.0001 | Ancient Persia (Iran) |
| Tenrikyo | 0.0001 | Japan |
