Natural selection explains, for example, how the giraffe got its long neck, Seeker. What else would you like explained? The origin of the universe? We don't yet fully know, and may never know, but the beginning seems to have been something we call the big bang.

The problem with "god", as pointed out earlier, is that if you insist that every complex thing must have a creator, then that leaves the question: who or what created god? Saying "god has always existed" means that not every complex thing requires a creator, which was the initial premise.

None of this disproves god, just as no-one can prove that there isn't a 1955 Cadillac in orbit around Saturn, for instance. The Cadillac & god seem equally unlikely, but neither can ever be ruled out.