My grandparents have been married for 75 years. They are not religious people, don't claim any denomination, don't go to church, but my grandfather once hit someone over the head with a crowbar for talking trash about women. My grandmother actually chose to be with my grandfather over religion (she thought she had to choose between devoting herself to God, or devoting herself to her husband, and she chose to get married rather than stay with any church) - they understand the beauty of monogamy, of having a soul mate, despite religion... but I agree, most people who "get it" are religious.