What's so moral about some species or individuals surviving and others not, animals eating each other, and all the other cruelties of nature?
Well, this was all you gave me. Of course I don't think that anyone really views the world like that(for the most part), but it is the natural conclusion if you follow any form of natural selection.
I'm often confused by the foundational beliefs of humanists, atheists, agnostics, etc. They seem inconsistent to me - I never hear anything about the evolution of morality, love, spirituality, etc., or even any explanation beyond the fact that humans are merely other animals. I resist this because I see more to it. So of course, don't let me put you into a box, and give me a clue to THE TRUTH as you see it.
I don't think that you have to believe in God to be moral - Its just seems more logical. It is easier to believe there is a design (intelligent of course) and something higher than myself than it is to think that everything is the result of random mutations - Faith in something rather than faith in nothing.