“… Among other things, it demonstrates the absurdity of the misperception, shared by so many otherwise highly intelligent people from ancient to modern times, that we will not act morally unless we have some rational reason for doing so, such as the dictates of a God, or the systems of philosophers. …”

That reminds me of a debate I once heard between a religion advocate and a religion skeptic. After the advocate listed all the beneficial functions of religion in society, he continued:

Advocate: “Why religion does so much good, if God didn’t exist you’d have to invent him!”

Skeptic: “They did.”

Advocate: ” ….”