Hitler, Stallin, Mao, etc., people always bring them up to favor religion, but those people were religious leaders, religion is not exclusive to the ancient writings and old beliefs of things people like me call myths, religion covers all beliefs used to control people, even the modern ones, Hitler was a God to a lot of germans, so was Stallin to soviets and Kim-Jong-il to north koreans, once i heard that there was a belief among many north koreans that Kim has the power to control the weather based on his mood, if that's not religious belief, i don't know what is...
Religion was invented by men, the ancient and modern books, the temples, churches, mosques, propagandas, celebrity centers, all by men. And men sometimes have a good agenda, and sometimes they don't, (hell, sometimes they have mixed agendas) the problem is to follow blindly everything the religious leaders say without thinking rationally about it ...