According to the World Christian Encyclopedia: A comparative survey of churches and religions , Christianity is the largest religion in the world with 33% (2.1 billion followers) of the world's population expressing a minimal level of self-identification adherents of Christianity.
Islam is the 2nd largest religion with 21% (1.3 billion followers), followed by Secular/Non-Religious/Atheist/Agnostic people making up 16% (1.1 billion) of the world's population.
The other classical religions follow with Hinduism having 14% (900 million), traditional Chinese religions having 6% (394 million) and Buddhism having 6% (376 million) followers respectively.
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