Not to pick on Time too much, but God does not appear in the Narnia books, just as God doesn't appear in the Potter books.

I suppose you could say that Magicians Nephew, in which Aslan creates a new world, comes close, but there's no distinctive God talk. And suprisingly litte theology in any of the Narnia books--they are not, as Time put it "dripping with theology."

There is something that the Narnia and Potter books have in common--the absolute belief that love can conquer death. And that love can overcome power. The central turning point in The Lion, the Witch, and the Wardrobe comes when Alsan is killed by the White Witch -- giving his life in exchange for a boy named Edmund. This sacrifice, referred to as the "old magic" eventually destroys the Witch's power.

The central turning point of the Potter books is revealed at the end of the Sorcerer's Stone, and remains a common theme of all the books--love is the most powerful magic of all-- and the power of Lord Voldemort is shattered when Lilly Potter lays down her life for her son--again referred to as "old magic" -- and that sacrifice leads to Voldemort's downfall.

Of course, you've got to have ears to hear and eyes to see. Or at least read the source material.