Yes, yes, I know, a book can't have a relationship with Christ, so the adjective is not accurately used. But I think you know what I mean: works that are written from a world-view that is consistent with Christianity. That's just such a mouthful.
Anyway, I started my list and only got this far; what would you add?
Anything by C. S. Lewis
Anything by George MacDonald
Anything by J.R.R. Tolkien
Anything by Dorothy Sayers
Father Elijah: An Apocalyps, by Michael O'Brien
Byzantium, by Stephen Lawhead
I'm adding to this list as we go, so don't fault my commenters for mentioning things that are already on the list. They weren't on the list at the time of comment. (I swear, though, that I had Tolkien, but he disappeared).