I'm in a similar situation with my wife, and to avoid conflict we use the tried and true method of not bringing it up. That "works", but isn't particularly satisfactory. We both feel like: "If our relationship were as good as we'd like it to be, we should be able to talk about anything." However, any discussion about religion lasting more than 5 minutes leaves one or the other or both of us feeling crummy. Like our points are not being heard by the other party. Add in the complication of hell: that is, she thinks I'm headed there, which is a painful thought for her, and I feel guilty for "causing" her that pain.
Well, I don't have any solution; just wanted to jump into the self-pity party.
Edited by Aware Wolf, : Spelling. One day I shall post a post that needs no edit, I swear!