Twilight and Mormonism
This whole series seems to be infused with Mormonism, which is understandable considering the author. Edward is described physically as Joseph Smith; Carlisle is in many ways portrayed as God; even Rosalie Hale is quite obviously a reference to Smith's first wife, Emma Hale. Similarly, the morals in the story
are largely Mormon: No sex before marriage, when it happens no attempts are made at birth-control. Free choice only exists so a person can choose to be virtuous by choosing to suffer, which Bella and the Cullens do continuously throughout; Bella by moving to Forks and taking on all kinds of domestic chores afterwards, the Cullens by abstaining from human blood which weakens them and causes them to always be longing for it.
When Bella becomes a vampire, she does it by dying - and being reborn as a Saint
, finally equal to her angel Edward. The sparkle-in-sunlight effect is comparable to a body-sized halo, such as saints are seen to have in certain paintings. Of course, once one is a vampire one is practically omnipotent - there is nothing you can't do - like a God
Meyer herself has admitted to being influenced by Mormonism in her writings, although she denies intending it as propaganda.
However, when Bella sees Edward's "phase" of murdering people in his vampire youth as "natural", it is more reminiscent of Meyer's views on youthful mistakes - like giving Jacob a free pass on his sexual assaults and pedophilia - than of anything an actual person who isn't a sociopath would say.