Yay Kat Medium. Right on. Currently, there are 4,400 religions on this dinky little planet. There are 7.7 billion humans. Of these, there are 1.16 Billion Hindus, 1.9 Billion who believe in Islam, 1.2 Billion Atheist's and a polyglot of 2.2 Billion Christians. Atheism is the fastest growing belief on the planet. Why? We are 2 chromosomes away from chimps. What do they believe in?