- Written for Christians
- Written by a Christian
- Written from a Christian worldview (hopefully goes with #2)
- Written to promote Christianity
The only examples I can think of that I have read are the Space Trilogy by C. S. Lewis, and the Lord of the Rings (LOTR) books by J. R. R. Tolkien.
Both authors are Christian (as much as we can tell). Not theologians, or rock solid on every doctrine, but seemed to hold the faith until the end.
The Space Trilogy seems to appeal to Christians more than non-Christians, and is reasonably consistent with the Christian worldview (although, more allegorical than literal).
But what about LOTR?
There are actually a lot of Christian themes in the books. However, when I read them, I didn't see them (they are not explicit). Furthermore, Tolkien pretty much created the whole industry for high fantasy (D&D, etc.) - which many Christians oppose.
I'm not sure where to place The Skin Map. It is certainly not overtly Christian, but that cannot be seen for sure until the conclusion. It is fairly Molinist so far, which is where a lot of Christians are... (although I would consider it heterodox, and potentially dangerous).