How Many Religions Are There Worldwide 2024. As of 2010, christianity was by far the world’s largest religion, with an estimated 2.2 billion adherents, nearly a third (31%) of all 6.9 billion people on earth. Determining an exact number remains challenging due to the nuances between religions and denominations.

Percent of adults who say religion is very. Some of these temples have been around for thousands of years.