No, its not Mormonism. My mother was Mormon before she met my dad, so I know a bit about it.
The heaven like place is more like a grassy field where everyone lolls around, to hear her talk about it. It is one of those 'build-your-own-religion' things, where they just sort of make something up to beleive in, they have no basis for the 'beleif'.
She doesn't 'get' Christianity. I think when she says she 'tried' it, she means that when she took a religion class in school, they did abt. an hour skipping quickly over it. I don't know. But I do know that the class she took at school really messed her up in her thinking abt. religion. She's got the idea that all religions are equally good, and that some things work for some people, etc. I did try to argue that one a bit, because, really, if all religions are equally good, then none of them serve any purpose.
But there'd be no story without all this dissention
So I inflict the conflict with the utmost of intentions