Big deal. A person’s background, beliefs, philosophy, etc., will often make its way into fiction books.
Well, it is a big deal if you have a Mormon worldview inculcating the wider culture. For example:
From the article: Bella describes her vampire boyfriend, Edward, as an angel whom she cannot imagine “any more glorious.” Edward’s skin sparkles in the sunlight, and he visits Bella’s bedroom at night. But Mormon angels don’t have wings; in the “Twilight” film, Edward sits in the science lab, the outstretched wings of a stuffed white owl just over his shoulders.
Mormons are big on angels. It’s not a cross that adorns their temples, but an angel – Moroni – a dead man – a “ghost” who Joseph Smith said appeared to him to show him golden plates.
Imagine that. Resting your entire life and eternity on a 14 yo boy who said a ghost appeared to him.