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All scripture is by God given to man for reproof, instruction, guidance, as it says in so many right says in so many translations.

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I would not personally marry a nice girl who was not a christian, in fact, I would not do more than tell them it win't work.
Now....that said, I understand many now in situation where with non-christian now seeing, and, everything seems fine. But I would not, it is a definition of being unyoked, not with same fundamental belief, in this casé it's religión. For me, the details matter, and, if you are christian following and she is worldm ways following then that is too much for me to handle. Either your for God or not, I don't think it can be both ways can it? And, if it is both ways, what does God say about being 'lukewarm,' in scripture??
Flippant to say, perhaps, but, for me, and, I am not saying I am right , just outspokenly correct for my own beliefs, but, to me, if I see a non-christian, that would be putting the devil in the details.
But, the Lord leads, and, IF He (God) saw for for me to date a non-christian, then I would, but that sigma from Him would have to be as clear as one in a cornfield