We definitely have talked about it, and agreed on the condition that is keeping us from getting engaged. To be fully candid, it's his faith. He was agnostic when we started dating and we've been working to help him figure out what he believes in the whole time. We've agreed we are waiting for marriage until/if he makes the decision to accept Christ. He hasn't told me this happened yet, but recently he has made comments about wanting to become stronger in his faith, learning some more stuff so he can stand up for what he believes in in the most educated way possible, etc. I'm wondering if he came to accept Christ and isn't telling me because he wants to surprise me. I'll keep an eye on it, I don't want to question him on it because I don't want to pressure him to rush into the choice if he isn't ready thinking I'm impatient with the process. Just a lot of raised eyebrows lately.
Okay, this is total speculation and having in mind that I have no idea how he is like, but that being said:
If I was in a situation where I have to figure out my religious beliefs in order to get to marry someone, and hypothetically speaking, if I realized that I just can't make a decisive choice about my beliefs anytime soon, and I wanted to marry the woman anyway, I would probably be under pressure to find a compromise where I get to marry her and at the same time get either more time with the religious question or to get to negotiate that part out of the deal.
Accordingly, such a conflicting situation could probably make me want to give vague hints to warm her up for an idea of such a compromise.
I'm not saying I would do just that, but those feelings would be understandable in such a situation. Religion is about as personal thing as there can be, and it would be entirely possible that someone comes to the conclusion that they're not very clear about it, but feel pressured to be clear for other than religious reasons, and want to solve the pressure somehow, like by for example attempting to change the rules.
Repeat: total speculation. He is the person you should ask, the rest of the men on the planet can only speculate.
(And for the record, I would find being in such a "You must accept Jesus in order to get the princess" - arrangement extremely unpleasant, and I would probably be very skeptical about participating in the first place, but then again I fully realize it's absolutely none of my business what makes other people happy and how they want to arrange their relationships and I hope things will work out for you two. Just mentioning.)