8. Spiritism (15 million adherents)
In the early 19th century, a French educator named Allan Kardec founded Spiritism. Unlike most religions, the founder is not a prophet. In fact, Spiritism does not believe in prophecy.
Kardec wrote five books about Spiritism. They are based on research and testimony of the spiritual world. This religion teaches the same values as Christianity. But it does not see Jesus as the son of God.
To the spiritists, Jesus is just the greatest example of humankind. Thus, Jesus’s words and actions are presented as law of nature in Spiritism.
They believe that humans are immortal spirits which inhabit physical bodies to improve morally and intellectually until the day they pass through to the spiritual world.