Unfortunately, I think a lot of people marry for the same reasons I did. My girlfriend and I were great friends, and very respectful of one another. Affectionate, spiritual... and her parents expected us to get married. Her whole family did, despite the fact that the parents hated me at first (youngest daughter, ya know; I wasn't "good enough").
I never wanted to get married, and it was foolish of me, to have done it anyway. I hurt a good friend, ruined a positive relationship, and put myself in therapy. Don't get me wrong, I put a lot into it, but in the end she was just a lazy selfish bitch. But I knew that beforehand.
DÛke: Yes, she played Magic occasionally. She was not as "into it" as I was, but she seemed to enjoy it enough to play once or twice each week.
I won't comment on the religious aspect of marriage. I do believe though, that (at least in this country) marriage is treated too much as a "thing to do." That is, just something that two people who are in a romantic/sexual relationship see as the obvious next step. Furthermore, I've known people who get married with the expectation that they will eventually be divorced. I think it's stupid to do that, to enter into a contract that one expects to break later on.
Don't make that mistake.
My advice: Be certain. Be absolutely certain that you want to share the rest (or at least a significant portion) of your life with the person you're thinking of marrying.*
Best of luck to you.
*This is a general statement, by the way, not directed at any one person.