Firstly, no one believes in religion, people believe in a religion, not the concept. Those politicians portrayed themselves as theists, because if they didn't, they would be labeled heretics by the Church and they probably would have been killed. (You can even see this behavior today. I strongly believe many politicians today are non-believers. There's absolutely no way there's no non-believers in congress as statistics dictates. I'm confident Obama is an atheist. His mother was an atheist, a sovereign one. His grandparents, too. And his biological father and step-father were Muslim, however, he claims he's a Christian. Hence, a blatant lie.)
I don't necessarily agree with you on that religion came about because of "how shitty peoples lives were during BC times, and they needed to give themselves hope." I suppose that's a factor, however, not a main factor. I think lack of perspective and knowledge, superstition and principle of having a theory instead of no theory were the main factors of religious doctrine and ethics' genesis. The government didn't intentionally use religion to control the masses. The government thoroughly believed, too.
This theory of yours of what happens after death is purely based on superstition. The evidence of your hypothesis is equatable to that of God's, whose existence you deny. You have to demonstrate the existence of this energy and the existence of the soul, which is a purely religious concept. I find it much more reasonable and rational that we just experience the sensation of eternal sleep after death, which is nothingness.