I dated many LDS guys before him.
I understand that he us trying to study but I'm doing everything in my power to. Honestly, I don't have very good advice, but keep being you and hopefully she won't let her religion blind creep 69 like it blinded me.
I believe that marriage and kids is not something that can't be handled, I'm sure that once kids arrive somehow both parents will do whatever it takes to be there for the kids, however I'm also sure that you will be the one most likely to carry the weight a bit more and of course feel it too.
My dear faithful LDS aunt married a good non-member man.