You know, I know the science is borderline, that genetics is complex and that there's free will involved and the whole area says nothing about the existence of God. But I do like the whole concept of a "God gene".
By enabling humans to perceive meaning in adversity, and a sense of optimism, it's posited that the " God gene" gives religious believers a slight evolutionary advantage.
So don't waste your time arguing with Darwinian atheists. Just rejoice. We have better genes.