Inter-faith marriages can work; I'm agnostic and my husband is LDS. He's pretty devoted as far as I can tell. He goes to church and teaches and seems to believe about as solidly as one can believe in a faith without going off the deep end. He comes home with a constant stream of compliments he gets from other church members about his insights and the quality of his lessons. I'm about as lacking in faith as one can get (without being an atheist). I have seen zero solid evidence for deities, and though I can't possibly discount omnipotent beings (on the basis that omnipotent beings can exist very happily without giving any solid evidence of their existence), I don't see enough use for them in my life to make them worth putting time and effort into discovering. And yet, we've been married for several years, and haven't had more than the rare fight as an issue. Many people (if not all) have deal-breakers in relationships. I'm guessing here that the problem is less generic inter-faith marriages, and more that her specific interpretation (or, as it sounds, the interpretation she chooses to take from others, perhaps because of social pressure) make an inter-faith marriage a deal-breaker for her. I don't really have a lot of happy sunshine advice, (and I have no authority to say anything about mentioned deity's degree of fairness,) but I would imagine that since faith is so highly emotional and highly subjective, neither of you should lie to the other about it. You wouldn't be happy. If you can't believe Mormon doctrine, you can't. You need to be honest and up front with her. Even if she does leave you, I think it would be better than prolonging a failing relationship by trying to prop it up with lies. That just builds up resentment and makes the deterioration slower and more painful. If she can't be married to someone that can't believe Mormon doctrine, she should divorce you for the same reasons. It sucks, but getting it over quickly and moving on is likely the best answer if it can't work out. Of course, if your faith in Mormonism does revive, or if she finds she can be married to someone who is not of her faith, then that's great! Hopefully it will either work out, or your troubles will be brief and amount to useful experience. That's my experience and two cents. Take it or leave it as you find useful.