What Are Some Good Non-fiction Christian-themed Books For Teens?

I was thinking non-fiction Christian-themed books, but not necessarily Christian non-fiction. Most of the kids I have in mind do not attend church, so I don't want it to be filled with a lot of foreign concepts. Just the idea of moving them towards an understanding of Christian principles of love, grace, and forgiveness.
 
The list gets pretty narrow because most Christian themed authors are going to go to Christian publishers. C.S. Lewis is a notable exception, but the non-fiction part complicates it a bit. Any particular reason you need it to be non-fiction?
 
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