Now my favorite book in the so-called "Valis Trilogy," The Divine Invasion takes the heady gnostic concepts of Valis and truly presents them in an unabashedly "sci-fi" context - the infant Christ has been reborn on mars to a woman with M.S. after a divine conception, and must be smuggled back onto earth, which is completely under Satan's control via artificial intelligence and totalitarian government. And that's merely the setup for a book that ends up in a completely different place than you'd expect, and which contains scenes like the young Emmanuel accelerating his reality and ascending through levels of existence that would make Grant Morrison green with envy (if he didn't already acknowledge completely and unabashedly plundering them for his entire career!).