I'm going to be an outlier here coming from kind of the other side of the situation because I was not much of a Christian before I met my GF but now I've been changing a lot. I'm just going to ask you a few questions.
Is he completely not a Christian? Believe it or not most people do at least associate themselves with Christianity even if they are not a church-going Christian. They will many times try to seek Christ if they truly love you and are willing to change for you (the problem is people will try to trick you here so you really have to be careful). If he is completely against Christianity, even though I personally would not say it is a problem under some circumstances, the Bible is very clear with a few verses that this is not OK and it is just something you are going to have to live with. Being a Christian is not always fun.
Is he a moral person? Sometimes I see good Christian girls get more corrupted by their supposed "Christian" boyfriends more than other guys who are actually just moral at heart, because the sad fact is that many Christians fall to just as bad as depths of immorality as do non-Christians. And many Christian women end up marrying moral non-Christians or moral lukewarm Christians.
Anyways, whatever you decide to do, be very careful because us men do lie sometimes, Christian or not. I'd say the most important thing is to not give up YOUR morals for the sake of a guy if that means forgeting him, so be it.
Now for some practical advise: try distancing yourself from him in the sense that you are attracted to him. DO NOT DATE HIM or anything yet, but be good friends with him. Start inviting him to go to church with you and make it very clear to him what you believe. Take him to youth groups instead of going out to dinner with him or something. By doing this you will get a better perspective about who he really is and if he will be willing to change. It will also be some time to get to know him better in a good environment away from temptations of any sort. You will have a better picture of what to do after this. My GF did this with me before we dated and I actually found I enjoyed going to church with her... who knows... peace