Largest Population Religion In The World 2025. Although china is officially an atheist country, its protestant population is likely to swell to 160 million by 2025, according to a religion expert, who says not many are prepared. Estimated religious composition of 198 countries and territories for 2010 to 2050

The core of the belief, despite the glaring differences between. Christianity is the largest religion in the world, with an estimated 2.38 billion followers.