I was in a similar situation. Not married yet, but engaged (been together 7 years). My faith started dwindling several months ago and it resulted in a lot of tears and emotional distress for my fiance. I'm now an atheist and she knows it, but am still dragging along to church and saying prayers and that kind of stuff even though I don't believe any of it.
Best of luck, I'm still trying to figure out how best to handle it myself.
Best of luck, I'm still trying to figure out how best to handle it myself.