Re: Christian Fiction for Teens?
Focus on the Family has some kids and teen books out. I read one of their books in my teens once (Unplanned Summer or something like that; it was about teen pregnancy and abortion pretty much), and I liked it at the time, so that's one place to look for books. C. S. Lewis has the Narnia books (hey, some teens still love those books), that sci-fi series, Screwtape Letters, or a couple allegories. Frank Peretti writes some pretty awesome Christian thriller books (like This Present Darkness), including the Cooper Kids series geared more for older kids/younger teens. There's also the Christy series by Catherine Marshall; I haven't read them myself, but they're still pretty popular I think. I remember reading the Archives of Anthropos by John White; really blatant allegory (much more than Narnia, believe me), but I thought they were really awesome books when I was younger.
Be anxious for nothing, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. And the peace of God, which surpasses all comprehension, will guard your hearts and your minds in Christ Jesus.