Hi. My biological parents are both gay (mother and father). Nice to meet you. They will be surprised to hear they can't reproduce.
You are confusing, rather absurdly, the difference between believing in a fact of life (evolution), and basing ones morals on the idea that everything they do should further the goal of said fact. If we were social darwinists on that scale, we would also desire your murder since your failure to grasp this obviously makes you an unfit specimen to reproduce.
Know what happens when something is anti-evolutionary? That thing dies out. Its not happening with gays, so obviously its not anti-evolutionary.