You are not respecting his religious beliefs if you expect him to do things in the bedroom that he feels guilty about. You are expecting him to compromise his values and who he is. I see that as the bigger compromise than the ring. It sounds like you guys have more to talk about, either with each other or a counselor. If you are starting out with unresolved issues like this now, it is not going to get easier or better once you are married without working through this stuff.