Is There a Free Will?

C.S. Lewis says we're often choosing between two things that are both good. And so we're exercising our freedom, but a lot of people would argue, no, there is no freedom. How do you respond to that type of materialist argument? I think it's kind of strange that we would be making the case that there's no free will with a reasoned argument, because if there’s no free will, then I'm determined to think there's free will already," he said.