First comes an idea. Then, characters begin to evolve out of the landscape of that idea. And then, finally, characters dominate: plot is simply a function of what these people might do or be. Everything has to flow from their personalities; otherwise it will not be emotionally engaging, or plausible.
Well I think fundamentally, what I think surprises me is the creationist movement, and the notion that somehow you can't believe in God if you believe in evolution. But I don't think there's anything in the Bible which prevents a recognition that evolution is a highly plausible way that we came to be here.