Your first mistake is assuming that atheists and evolution proponents are one-and-the-same. Since you can't get that straight, I think it's a waste of time to comment on the rest.
My post is directed primarily at those who are both atheist and hold to the theory of evolution. I am guessing that the atheist/creation intersection is rather small and can be ignored. That leaves the theist/evolution intersection.
Whether atheist/evo or theist/evo, my question still applies. The only difference between the two will be the manner of gymanastics performed to answer the question.