My mother is a white girl, grew up Christian and my father is a Muslim Palestinian. For the 15 years that they were married, my mother had converted to Islam just to keep peace in the house. They ultimately ended up with divorce and she swears she will never marry outside of a Christian (if she ever marries again).
Religion plays a huge huge role in life. It dictates which holidays to celebrate, basic morals, and above all, you need to be able to confide in your partner. If you are with a Christian girl, she will want you to go to church and be able to talk about what she learned and cool experiences that she's had. If you aren't a Christian as well, she wont be able to have those conversations because you won't fully understand. And that is just an example, I'm not saying you need to be Christian.
You should be with someone who is on the same level as you religiously.
As for culture, I have no idea. I always have white or middle eastern boys, nothing else ever interested me.
I am of the belief that religion has become the biggest crock of **** on Earth, I do believe in God, make no mistake about it, but religion is merely a man made process of how we connect with God, and that is mostly ****ed and see the results, its not pretty, we got people murdering each other because of it, we got people following stupid and ******ed rituals and beliefs because of it and we got so much division on this planet because of it. I do believe in God, but I think religion is ****ing Evil.