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You've answered your own question. God says don't yoke yourself to a non-believer, in dating one you'd be doing that very thing He tells you not to do. There is NO BUT, God changes people, we don't. God may choose to use you in changing this mans heart through a friendship.
Another thing to note is that saying "nothing would change my faith", is a challenge for the enemy. I've noticed people around me say things to this extent and then they crumble. If you let the world in, even just a bit now, it will make it harder for you and in turn it will change your faith in a different way (even if the change is simply that your faith is constantly being tested).
Seek God in all you do. God bless!
Another thing to note is that saying "nothing would change my faith", is a challenge for the enemy. I've noticed people around me say things to this extent and then they crumble. If you let the world in, even just a bit now, it will make it harder for you and in turn it will change your faith in a different way (even if the change is simply that your faith is constantly being tested).
Seek God in all you do. God bless!
Very wise words said right here by SmileON