Before we fall into legalism and start laying down the law about who you can and cannot marry, let's consider WHY God would want us to be on the same page spiritually as ur spouse....
I dont normally post on these forums unless I know something about the topic personally from experience...and in this case I know this kind of topic intimately. When I was married, I was a devout Catholic and my husband was fiercely anti God and anti religion. At the time my faith was not a big part of my life, it was more something I did on Sundays and that's about it, so me marrying someone who wasnt a catholic really didnt bother me.
But let me tell you this...on the 7th of December 2004 it became the single most troubling and distressing thing of my existence. From that moment, I knew my life had changed forever, and yet my husband was NOT on for the ride. IN fact, he actively went AGAINST my new faith, and I am convinced that while he was reluctantly supportive, he thought deep down that it was a phase I would tire of eventually.
Putting aside the legalistic view, instead consider the practical implications. I could not pray with him, share with him, go to church with him, discuss anything to do with God with him. It would be like me having a child and yet having to ignore that child while living with my husband every single day....the BIGGEST thing in my world, and I couldnt share it with the one person who I should be sharing it with. I wouldnt wish that kind of pain on ANYONE, I ACHED for him, I WEPT at night into my pillow BEGGING God to touch my husband and turn his heart. I couldn't believe how much I needed my husband to share that part of my life with me, and I was completely helpless to make that happen. Instead I had a long, agonising wait, forcing me to trust in God that He would save the love of my life.
This story does have a happy ending...my husband accepted the Lord in 2007 and has been walking with Him ever since. And the joy I feel in my heart having him by my side singing to God on a Sunday cannot be imagined.
Please, please, PLEASE....make sure that you marry the person who is spiritually ont he same page as you!!! Soemone who can lift you up and soar with you to new heights! You're not being fair to yourself if you start out as a Christian and dont choose for yourself someone who will share that incredibly big part of your life with you! You deserve more!!! I didnt have the knowledge then that I have now, and thank God too because through my salvation my husband found salvation also...but if you do have that knowledge, USE IT!