Religion # of Followers Founded Holy Books/Texts Founder


Christianity 2.4 bil First Century Bible Jesus Christ


Islam 1.9 bil 600 AD


Qur’an, Hadith (sayings of the Prophet) and Sunna (descriptions of his


way of life.) Muhammad


Hinduism 1.2 bil Unknown, but at least 2000 BC The Vedas Unknown


Buddhism 0.5 bil Late 6th Century, BCE Tipitaka, Sutras, The Book of the Dead Siddhartha Gautama


Nonreligious/Agnostic/Atheist (see notes below) 450-500 mil


Sikhism 26 mil late 15th century the Adi Granth and the Dasam Granth Guru Nanak


Judaism 14.7 mil 1800 BCE the Tanakh Abraham


Taoism 9 mil 500 BCE Tao Te Ching (many authors including Zhuangzi) Lao Tzu (little evidence he existed)


Confucianism 6-7 mil 6th-5th century BCE The Analects disciples of Confucius, Mencius


Baha’i 5 mil mid 19th century The Kitab-i-Aqdas (the Most Holy Book) Baha’u’llah


Jainism 4.2 mil 6th century BCE


No one holy book, but many religious texts, the most well-known being


the Agam Sutras Nataputta Mahavira


Shinto 4 mil pre-6th century Kojiki (Records of Ancient Matters) along with the Nihon shoki No founder


Zoroastrianism 2.6 mil 6th century BCE Avesta Zarathustra (or Zoraster)


Atheist 450-500 mil (both)


The God Delusion (Richard Dawkins); The End of Faith (Sam Harris);


God Is Not Great (Christopher Hitchens); Breaking the Spell (Daniel


Dennett); The Four Horsemen ( a book on the New Atheism by all four


men)


Early thinkers: Epicurus, drawing from Democritus and the Atomists, Anaxagoras.


Later thinkers: Matthias Knutzen, German critic of religion, 1674. Ludwig Feuerbach,


Father of Modern Atheism (1800s). New Atheism: Richard Dawkins, Sam Harris,


Christopher Hitchens, Daniel Dennett and Auyaan Hirsi Ali (until her conversion to


Christianity in 2023).


Agnostic See above 1869


The Ethics of Belief (W.K. Clifford, 19th cent); Agnosticism and


Christianity and Other Essays (T.H. Huxley, 19th cent); A Treatise of


The Sophists and Socrates (not of Plato’s Republic), ‘agnosticism’ first coined in 1869


by T.H. Huxley, David Hume, Immanuel Kant, An Agnostic’s Apology and Other Essays

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