...State why as well? Christianity 2.1 billion Bible Abrahamic Jerusalem Israel , 1st century
Islam 1.4 billion Quran Abrahamic Mecca. Saudi Arabia , around 610
Irreligious/atheism 1.1 billion none N/A none N/A
Hinduism 900 million Vedas Dharmic Varanasi Around 1700–1100 BCE, North India
Buddhism 500 million Tripi?aka Dharmic Bodh Gaya Around 400 BC, East India
Chinese folk religion 400 million Taoic
Traditional religion/Animism 300 million
Deism 200 million none N/A none N/A
Sikhism 22 million Guru Granth Sahib Dharmic Amritsar Around 1490
Juche 19 million
Spiritism 18 million
Judaism 16 million Torah, Talmud Abrahamic Jerusalem Around 1500 BCE
Bahá'í 9 million Aqdas Abrahamic Acre Iran , in 1844
Wicca or Neopaganism unknown
Islam 1.4 billion Quran Abrahamic Mecca. Saudi Arabia , around 610
Irreligious/atheism 1.1 billion none N/A none N/A
Hinduism 900 million Vedas Dharmic Varanasi Around 1700–1100 BCE, North India
Buddhism 500 million Tripi?aka Dharmic Bodh Gaya Around 400 BC, East India
Chinese folk religion 400 million Taoic
Traditional religion/Animism 300 million
Deism 200 million none N/A none N/A
Sikhism 22 million Guru Granth Sahib Dharmic Amritsar Around 1490
Juche 19 million
Spiritism 18 million
Judaism 16 million Torah, Talmud Abrahamic Jerusalem Around 1500 BCE
Bahá'í 9 million Aqdas Abrahamic Acre Iran , in 1844
Wicca or Neopaganism unknown