The largest religion in the world, in terms of number of practitioners, is

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According to the Pew Research Center, Christianity is the largest religion in the world, with an estimated 2.3 billion followers as of 2015. Islam is the second-largest religion, with an estimated 1.8 billion followers. Hinduism is the third-largest religion, with approximately 1.1 billion followers, followed by Buddhism with approximately 500 million followers. Judaism is a relatively smaller religion, with an estimated 14 million followers.

The Largest Religion in the World, in Terms of Number