God wants the best for HIs children. He wants to give you good gifts.
Jam 1:17Every good gift and every perfect gift is from above, and comes down from the Father of lights, with whom there is no variation or shadow of turning.
. If you marry a person who is in darkness, what does light have to do with the darkness?
God knows what is best for you, sure the OT is God's word, all of it is, and He wants the best for you. But we are in fact living in Grace, and sister if you heard some of the stories i have heard about being unequally yoked, its not good.
I went to a retreat once and are teacher gave a great example so i'll now share it with you.
She took a chair and stood up on it, and than asked a person to stand bellow her. She than said, now let me try and pull you up. She could not pull that person up, it was very hard, of cours unless the person was going to try and climb up the chair. Than she asked the person standing bellow her, to pull her down. She came right down from the chair. Do you see the point? Its easier for a person to pull you down when you are up. Like satan, he uses many things to try and stumble a beliver. why go there when God has a perfect plan for your life. Sure God can save that person as you and i, but why go threw the torment of somone not repecting what you belive. What if they think your praying is weird, what if they don't like your worship music. i had a sister in the Lord marry a non beliver, and he said he was a christian. She knew not to marry that guy. it did not get better, it got worse, much worse. She was a beutiful singer of worship, and stopped once she was married. just pray and Ask God to show you who He wants you to marry, and if you are in Christ, He will bring that right mate to you if in fact that is His will.