Tomorrow night I'm going on a date with a Christian. I am a total athiest?

It's funny, religion is just something I just can't agree with. But other than that he's cute, interesting, VERY funny, and seems like a really nice guy. I don't know him very well (we met once, and he's been pestering me for a date for about 4 months since despite me totally blowing him out constantly!) I think we'll get along okay but it's just weird, I'm totally athiest, I'm really not a 'pure' little Christian girl, I drink, swear, have etc. I don't even get why he's interested! What do you think?