Professor Garret Merriam argues that if God exists, then we can’t be moral. In other words, we can only be moral if morality is not grounded in God’s existence. This is a reversal of the moral argument for God’s existence. It’s a moral argument against God’s existence.
Like many new atheists, Merriam argues that the Christian God commands and commits evil, so if morality is rooted in God and our moral duties are based on God’s commands, morality is impossible. I don’t accept the premise that God commands or commits evil, but let’s grant it for the sake of argument. Does his conclusion follow? No.