Jerry A. Coyne in USA Today:
One cold Chicago day last February, I watched a Federal Express delivery man carry an armful of boxes to his truck. In the middle of the icy street, he slipped, scattering the boxes and exposing himself to traffic. Without thinking, I ran into the street, stopped cars, hoisted the man up and helped him recover his load. Pondering this afterward, I realized that my tiny act of altruism had been completely instinctive; there was no time for calculation.
We see the instinctive nature of moral acts and judgments in many ways: in the automatic repugnance we feel when someone such as Bernie Madoff bilks the gullible and trusting, in our disapproval of the person who steals food from the office refrigerator, in our admiration for someone who risks his life to save a drowning child. And although some morality comes from reason and persuasion — we must learn, for example, to share our toys — much of it seems intuitive and inborn.
Many Americans, including Francis Collins, director of the National Institutes of Health and an evangelical Christian, see instinctive morality as both a gift from God and strong evidence for His existence.
As a biologist, I see belief in God-given morality as American's biggest impediment to accepting the fact of evolution. “Evolution,” many argue, “could never have given us feelings of kindness, altruism and morality. For if we were merely evolved beasts, we would act like beasts. Surely our good behavior, and the moral sentiments that promote it, reflect impulses that God instilled in our soul.”
So while morality supposedly comes from God, immorality is laid at the door of Charles Darwin, who has been blamed for everything from Nazism to the shootings in Columbine.
More here.