Christianity, in all its various denominations, includes approximately 2.2 billion followers, primarily in Europe, North America, and South America.
Islam, including both the Sunni and Shia sects, includes approximately 1.7 billion followers, primarily in the Arabian Peninsula, North Africa and Indonesia.
The Hindu religion, primarily based in India and the Indian subcontinent, includes approximately 1 billion followers.
Buddhism, primarily based in India and the Indian subcontinent, includes approximately 500 million followers.
Sikhism, primarily based in India and the Indian subcontinent, includes approximately 28 million followers.
Judaism, primarily based in Israel, includes approximately 18 million followers.
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