Actually, you can draw the distinction wherever you like.
There seems to be no hard and fast rule as to what literature could be 'acceptable' to Christians. It depends on what kind of 'Christian' you are talking about. For example, I've just been looking at a website called keepersofthefaith which recommended that C.S Lewis, Little Women, Anne of Green Gables and Laura Ingalls Wilder should be kept away from good Christian children because of their corruptive anti-Biblical influences.
And if I were going to be cynical, I'd say that a lot of these book-burners and book-banners focus on popular, high-profile works in order to attract attention to themselves and their sects.