Brandon's said he doesn't want to touch on a true "afterlife" in the sense of heaven or hell, because he wants to leave that up to the readers. And also, because if he confirmed an afterlife or a true God, that would invalidate some of his characters' beliefs, like Jasnah being an atheist.
So while I'm sure that LDS scripture has an influence on his writing, he's not going to dabble much in those waters in his writing.