This situation is almost EXACTLY the same as a period of my life, when I started questioning my Christianity, (Firm Atheist now) except for the huge family and my mom being especially "involved" in her church, among a few other things. At the time I also had an atheist girlfriend who thought my religion was stupid (rightly so) but never really bothered me about it because it never effected our relationship.

We ended up not working out, ironically enough because she wanted kids and I didn't (she was 19, I was 18) You don't mention her much, but if I were a gambling man, I'd wager that your girlfriend is probably the main reason you made this post. You obviously love your family very much, as well as your girlfriend, but you shouldn't have to subconsciously feel torn between the two. Unless your parents are the extra special type of "pious" theists who would actually disown you or cut off contact from you, I wouldn't worry about it too much, If they're actually FORGIVING CHRISTIANS, I mean, isn't that JESUS CHRIST'S ENTIRE MESSAGE?? But if that argument doesn't work, then they are simply irrational people, you are not, and you should get away from them. I'm not close with my family at all because I can't have a conversation with any of them that doesn't make me depressed afterwards, in the sense that their proud anti-intellectualism makes me worry for the human race. I know I probably seem like a harsh, miserable person, but I'm actually much happier after having labeled myself a proud Atheist. I just don't fall for stupid bullshit because it makes me feel all warm and fuzzy inside, and you should be proud of resisting a thorough brainwashing. And your mom making a promise to God that she would raise you to be a good Christian?! To which you should reply "Mother, I love you and all, but at what point did you believe that you had the right to declare what kind of person I was to be in life?? Too often, for what seems to be most of human history, parents hold expectations far too specific, and unfairly predetermined for their children, then just expect their kids to follow their every wish with giddy exuberance, and become completely flabbergasted when everything doesn't follow according to plan perfectly. Mother, you're simply living in the past, because you're an older adult and culturally the world has been tailored to the wishes of adults, not teenagers, obviously. But in an age where the standard virtue of "respect your elders" simply doesn't hold true anymore, although I can see how in the past the experiences of the elderly were often the best sources of knowledge, TODAY, the largest, most comprehensive library of information you could ever ask for is The Internet, and let's be honest, younger people use it more often than older generations, and I would assume that the reason being for that, at least in a small part, would be the fact that maybe theists don't like seeing information that conflicts with their faith, and their faith is stronger than ours because they never had the Internet the way we have. A legitimate outlet with which to challenge your religion, available to all. Mother, you're anti-knowledge, and I'll always love you, but I'll never be the son you thought you ordered on demand, because RIGHT! LIFE IS JUST SOOO SIMPLE MA!"