If a person doesn’t already understand that cruelty is wrong, he won’t discover this by reading the Bible or the Koran — as these books are bursting with celebrations of cruelty, both human and divine. We do not get our morality from religion. We decide what is good in our good books by recourse to moral intuitions that are (at some level) hard-wired in us and that have been refined by thousands of years of thinking about the causes and possibilities of human happiness.
We have made considerable moral progress over the years, and we didn’t make this progress by reading the Bible or the Koran more closely. Both books condone the practice of slavery — and yet every civilized human being now recognizes that slavery is an abomination. Whatever is good in scripture — like the golden rule — can be valued for its ethical wisdom without our believing that it was handed down to us by the creator of the universe.
