Morals and Evolution

I've been asked and have asked myself many times if I believe in God, and I do and I also believe in Evolution, Science, and the natural world. I might need to say that the God I believe in is not necessarily the one represented classically but I'll get to that later. One thing that has bugged me about the evolution of our species, its the development of a God and morals. I believe in an innate sense of right and wrong in all people (even though some of it IS learned), its just so easy to ignore in order to be selfish. Evolution is necessary, but humanity has ignored the self serving nature by having morals and a God residing over those morals. Those who do believe that God was a creation of man in an order to feel comforted in a hostile world, I understand that, but why create rules that inhibit the very nature of a living organism. If you're going to create a being that governs yourself right now, it would make a lot of sense to make one that justifies everything you do. Why create a God that tells you to be a person of self sacrifice, self sacrifice is contrary to life (with the exception of preservation of species, like a mother saving her child). Life continues because it does what best serves it, self-preservation should not be trumped by self-sacrifice, but time and time again it is. Why would an organism EVER feel satisfaction from helping another, especially when there was nothing to be gained. That is my scientific explanation for God, but the "feeling" of a God and more importantly an internal sense of purpose that seems higher than anything else on earth. I have always felt a sense of duty to eventually rise to a challenge, and that doesn't come from a lack of purpose now. I personally, have always felt a need to fight for what was right regardless of consequences, and those consequences should frighten me away so that I can keep on living, and a great number of people still do. My willingness to sacrifice myself (if need be) is not made easier by the thought of a rewarded afterlife either, Even if I was sure there was no heaven or whatever, I would still want to end my life by saving someone else. All this contradicts my understanding of the natural world, and unlike most "Religious" people I test my beliefs constantly and refuse to be rigid in any faith I have.