I'm married to a believer. I was one while we were dating and through our marriage as well. She was never devout though. I think that is the key here. It depends on how devout one is. I think a hardcore theist is going to be tough to date or maintain a healthy relationship with. My wife believes in evolution just to give you an example. I love her 
"We are all connected; To each other, biologically. To the earth, chemically. To the rest of the universe atomically.”
-Neil deGrasse Tyson
-Neil deGrasse Tyson
