It isn't. True, it's an amazing book (and my best friend met the author, she's really nice), but Fiction is stuff that's not true. Non-fiction is truth.
I liked it until i realized a mormon wrote it and thats why Bella is so freaking pathetic and damsel-in-distress-ish. i prefer to keep my distance from books like that. although i must say, it was definitely a page turner, i red through all of my classes two days in a row to finish it.