- Christianity 2 billion
- Roman Catholicism : 1.1 billion
- Protestantism : 360 million
- Eastern Orthodoxy : 220 million
- Anglican : 84 million
- Other Christians : 280 million
- Islam 1.4 billion
- Sunnism : 940 million
- Shiism 120 million
- Secular/Nonreligious/Agnostic/Atheist 1.1 billion
- Hinduism 900 million
- Buddhism 360 million
- Chinese traditional religion 225 million
- Not a single organized religion includes elements of Taoism , Confucianism , and traditional non scriptural religious observance.
- Primal indigenous 150 million
- Not a single organized religion includes a wide range of primarily Asian traditional or tribal religions, including Shamanism and Paganism.
- African Traditional and Diasporic 95 million
- Not a single organized religion, this includes traditional African beliefs such as Yoruba as well as Diasporic beliefs such as Santeria and Vodoun.
- Sikhism 23 million
- Juche 19 million
- Not considered a religion by adherents. Juche is the political ideology taught by North Korean communists; some have argued it constitutes a religion.
- Spiritism 14 million
- Not a single organized religion includes a variety of beliefs including some forms of Umbanda.
- Judaism 14 million
- Bahá’í Faith 5 million
- Jainism 4 million
- Shinto 4 million
- Cao Dai (mainly Vietnamese) 3 million
- Tenrikyo 2.4 million
- Neopaganism 1 million
- Unitarian Universalism 800,000
- Rastafarianism 600,000
- Not an organized religion
- Scientology 500,000
- Zoroastrianism 150,000
- Source of statistics: adherents.com ( https://www.adherents.com/Religions_By_Adherents.html ), updated 2005. These statistics are based on analysis of a range of sources on religious populations, for more on the methodology; please see Adherent.com’s explaination