RING; buddy just marry her. See if you can tone down the religious stuff in the ceremony but it means way more to her than it does to you. I speak from experience: My wife wanted a wedding, I really didn't care if we were married or not. I was committed to her before we got paperwork that said we were. But I love my wife, she's my best friend and if this makes her happy and secure in our future together then why couldn't I just say "I will". Buck up, buy her a ring, and make it happen.