Every good Lewis mention deserves some Tolkien, too. In my wonderful Sunday School yesterday Father Pat taught, in part, about the dream of Pilot's wife. There's a remarkable likeness of her dream with the dream of the Magi. Both occur concerning Jesus at the end points of his life and both try to save Jesus from deaths plotted by the Jewish leaders. What's most interesting is they both spring from the minds of Gentiles - polytheistic, heathen, "unsaved" Gentiles.
These Gentile, Christ, dreams were crucial to JRR Tolkien's understanding of the nature of God, Jesus, salvation, and his fiction. Dreams are just another kind of form of myth, like a sonnet to poetry. Tolkien saw Jesus scattered all other European mythologies; they were God's whisperings to peoples who had never heard God out loud. Matthew acknowledges this twice in his gospel. The Gentiles recognize the Messiah as a king and a just man and a strong desire to stand up against the political forces to preserve Jesus' life. Their beliefs aren't comprehensive creeds, but they are faith and that's enough. Likewise, the Greenman and Odin don't match up with Christian theology at every detail, but for those who latch on with faith and act, the myths are enough.