My fiance is Atheist while I am a Gnostic Catholic. It has actually never been a problem or issue. Mainly because I see the person he is and how he lives his life. He may not be a "believer" of any religion but he does live his life like a believer. He cares about others, he tries very hard to do the right thing, and he defends what he believes in regardless of what that is. He is military and he never has a fit or causes a scene when prayers are stated or moments of silence or asked for. What I'm saying is that I don't think it really matters what you believe in faith wise. It matters how you live.