Equilibrium is awesome, very true!
You're right to say evolution doesn't say anything about the existence of God, unless it's JW's or other Biblical-Literalist Gods. Plenty of christians believe in a God that started evolution or something similar.
There are some explanations for the introduction and evolution of altruism, but the question you might ask is why God has made things this way. Is there a better way of doing things? Is this design perfect? I'll leave you to find your own answer to that. Carrying on with your research on evolution will probably help.
Best Wishes.