I wouldn't change. Why should I?
Neither should anyone. I'll explain my opinion.
If one member of the couple wants do go to the cinema and the other wants to go to a football match, every weekend, somewhere along the line they will argue because one won't go with the other. :flaw:
They don't compromisse, they won't at least try to go just to make the other happy.
They will say: you don't love bla bla bla bla....
My ex-girlfriend would sometimes tell me that she wanted to go to a bar with some friends and my answer was always: you should be there already.
I knew she enjoyed those places. I don't.
So, I didn't go to a place where I don't feel confortable and, althought I rather have her with me, I couldn't stop her from going wherever she liked.
And this is a religious aspect - respect for one's freedom.
So if you truly love someone, even if it's from a diferent religion, you won't even try to make him/her abandon their beliefs. I'd say that if you know that a person is happy with something that you are not fond of, you'll let her/him do whatever she/he wants.
And by the end of the day, you'll return to each other's arms and all will be alright.
(of course this won't aplly if your lover is a killer, or a pedo... that would be asking to much xd)
Conclusion:
Most people still can't truly understand the ones they love, so it's not even worth to talk about the ones we don't love.
PS.: I really don't want to marry. Never did. For me it doesn't make any sense. Why would I need? For God to bless me and to be happy? He blessed me the moment he created me. And He automaticly blesses everyone's relationships with this "thing" He gave us: LOVE. That is the true blessing, not the religious ceremony.