I don't see how Fruits Basket is Christian when it's totally based on the Chinese zodiac animals, but okay. XD; Hmmm....
Besides the ones already mentioned.. Saint Tail is a pretty cute one.
http://www.shoujoinitalia.net/90/saintail/StTail_lay.jpg I actually.. sort of forget how Christian it is, I read it a long time ago. XD; But her little nun friend was my favorite character, which is why it came to mind.
heart Also, Takahashi Rumiko did that short series about the Christian boxer who was in love with that nun... I read that even longer ago though, so that's all I can tell you. XD;;;; One Pound Gospel, that was it.
http://www.rumicworld.org/htm/opere/one_pound_gospel/img/main.jpgAnd, uuh.. that's all I can think of. *-*
I love anime with Christianity in it, because it sort of.. treats it like any other subject. It's refreshing. :3