Why do some religions command billions of followers while others vanish into obscurity? Is your faith popular because it's true, or because it evolved superior survival strategies? What if the world's dominant religions succeeded not through divine truth, but through the same evolutionary pressures that shape all living organisms?

Today we'll dissect religion like biologists studying natural selection, examining why Christianity and Islam dominate globally while religions like the Shakers have dwindled to near extinction. From the Catholic Church's ban on contraception to Mormon polygamy, from Islamic madrasas to Jehovah's Witnesses knocking on doors - these aren't random practices but brilliantly evolved survival mechanisms that ensure religious reproduction and expansion.