Calvin talks about man's free will so I doubt if you can get around the idea of "free will" entirely. When Reformers talk about man not having a "free will" it is in relationship to the inability to choose good. God's Spirit leads us to all truths. As believers we either listen to God's Spirit or follow after our lusts.
I'm sure I've read C.S. Lewis' view but at the moment I have a brain crap. I'll have to research it. But seeing how C.S. Lewis was a Catholic I'm sure it would fit within his paradigm. It does not and should not fit within the Protestant's paradigm.
CS Lewis was an Anglican.
It was Tolkien who was Catholic.