I would say not to date a non-Christian if you are a Christian but for different reasons. My Ex was a Christian when we started dating. She had true faith and truly believed. I was the heathen and pressured her to do things I should not have done. I loved her, then and now, and so I justified it to her and myself that I knew what was right for us. When she would want to pray to GOD for guidance, I would make her believe that I should make the call because I was going to be the head of our family. I was selfish and so many other things I don't want to mention, but I made her do all sort of things she knew was wrong but I used her love for me against her. I hate that I did it and I have asked GOD and her for forgiveness and I know GOD has forgiven me but for anyone I would say that I brought my Ex more heartache than happiness. I hope I helped you, GOD bless.
Also I should mention that I became a believer after she left and I saw what I was doing to myself and her. She changed me into the person I am but she will never have the rewards of seeing that change I made because I made it to late.