‘Isa: Because Lewis was a Christian, so he could not disagree with the teaching of Jesus and of all the prophets in Jesus’ Jewish tradition—and, later, Islamic tradition too.… Libby: What teaching? ‘Isa: The teaching that in order to be saved, to go to heaven, you need to repent. But you can’t repent if you don’t believe in sin to repent of, and you can’t believe in sin if you don’t believe in a real moral law, because sin means disobeying that. Moral relativism eliminates that law, thus sin, thus