What is the World's Largest Religion?

The world's largest religion is Christianity, making up about 33% of the world population.Other large religions include Islam (20%), Hinduism (13%), Chinese folk religion (6.3%) and Buddhism (5.9%).Christianity, which began as a Jewish sect, has been the world's largest religion for about 1600 years,Before that, the world's largest religion was likely Hinduism, which is so old that its beginnings are poorly understood.