“You must make your choice,” C. S. Lewis wrote in Mere Christianity. “Either this man was, and is, the Son of God, or else a madman or something worse. You can shut Him up as a fool, you can spit at Him and kill Him as a demon, or you can fall at His feet and call Him Lord and God.”

Lewis did not always believe this. Born in Belfast on November 29th, 1898, Lewis was raised as an Anglican but rejected Christianity during his adolescent years. Af…