first off, i'm sorry you're going through that. it's great that you have some clarity now that you're not dependent on her and see her for who she is.
#I feel stuck in a relationship
old raft
tbh difference in religious beliefs is a dealbreaker for many relationships, especially if partners can't respect each other's beliefs, which is the case with you two
it isn't 'ungrateful' if you leave her. people are experiences. she may have been a good experience once but that's no longer true.
like you said, she's toxic. its hurting you and your relationship. imo its best to leave
old raft
i get that it hurts. it must be really hard. but you have to take that step eventually, it's only a matter of sooner or later. either you do it now or in the future. why delay the break up and hurt yourself more?