Have you ever asked yourself whats the foundation of a relationship? A marriage?
It never came across me that Religion is a prerequisite of a marriage, I always thought the prerequisite should be LOVE, RESPECT, COMMITMENT and PROMISES.
Apparently Religion will put two person with different beliefs in different pages and you cant marry one person if both of you are not on the same page.
Mom and Dad always taught me that all religions are similar, they meant the same thing... I think that's why their marriage is still in tact, because they believe in the same thing. Of course they would quarrel like Cats and Dogs sometimes, but everything fell back on their commitment/respect/love to one another, it didnt fall back on RELIGION.