I am in a similar situation but the other way around and in a much worse position. I posted about my problem yesterday and I got some great advice but my advice to you would be that it is really really hard to get anywhere with this situation and I have experienced this myself. It is not just the faith issue that you will be confronted with but as you carry on and you fall in love with the person and you think about marriage, it will become a family issue. On one hand you may feel like you can take on the world and work miracles to be with that person forever but this world isn't all sunshine and rainbows and the longer it continues the more problems you will be confronted with.
I was the same age (first year of sixth form) when I got into a relationship with a Christian girl and nearly 6 years on you can't imagine how complicated it has become. I guess he being a Christian means he is not the same ethnicity as you?this will lead to even more problems.
I would be honest and say that right now you may be tempted to stay with him because of his personality and he seems to be the best out there and a whole lot of other reasons which outweigh the reasons to leave him but I would advise you to let him go (this is easier said than done) because, think about it yourself, what are the chances of anything actually happening between you two?
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