"God sent the human race what I call good dreams: I mean those queer stories scattered all through the heathen religions about a god who dies and comes to life again and, by his death, has somehow given new life to men."
Uh-uh. God didn't send those notions of false gods.
I'd not be too sure. Certainly God did not lead men into 'the delusion of idols', nor to spin tales of incestuous or violent 'deities', but those aren't what Lewis called 'Good Dreams'.
I'm guessing you're a protestant and don't have the relevant passage in your Scriptures, but for those of us who use the complete Christian canon, there is a passage that speaks of God assigning a guardian angel to each nation. The inclusion of the myth of Baldur the Beautiful among the myths of the Vikings certainly made the acceptance of 'The White Christ' easier. I find it quite easy to believe that the angel of the Norse managed to get a little hint of the truth in alongside all the demonic delusions of my pagan forebearers.
Christ's coming fulfills not just the prophecies of the Old Covenant, but all that was good or true in mankind's foolish strivings for transcendence before His coming. (Try reading the Tao Te Ching, remembering that the Tao occupied the same place in Chinese thought that the Logos occupied in Greek thought, and thinking of the Tao as a person--there is only one in history who fits, and the fit is almost as good as that between Christ as He revealed himself and the text of the suffering servant passages of Isaiah.)