Oh, son of a bitch, I have no clue what to do.
The background goes a little like this: My girlfriend has a 4 (nearly 5) year old from a previous relationship. I've been taking care of him and, for all intents, have been his father figure since he was 2. I have all the responsibilities of his father and wouldn't call him any less than my own son. I love the kid dearly. But, he's still not mine and that means certain decisions fall to his mother and my input isn't really considered. His father's father (yes, I know grandfather would've been easier to say, but it needs to be known that it's not his mother's father) is a Presbyterian minister. He goes to church with his grandparents every Sunday and is being raised in Jesus-like fashion. Although I don't have the qualms with Presbys as I do with the more hardline Christians, they're still very big on raising the kids "right".
Tonight, he came home from his first night of Vacation Bible School. I'm sure everyone here knows what that is. But, the shittiest part is that he comes home with this new CD he got from the thing. He elatedly squeels "Quentin! Please let me listen to this!" Of course, I'm not going to deny him. But, for fuck's sake I wish I had. The CD was 12 tracks of Kidz Bop style group singing of pop anthem, Christian songs. Lyrics like "He is the only way!" and "Let's get Jesus!" blared throughout our household. Great.
My girlfriend isn't a hardcore Christian. She definitely believes in God and buys the Jesus thing (but, I think she takes it with a grain of salt...I think) and has no problem with her kids being raised as straight theists. She doesn't want a Jesus freak in the house, but has no problem letting him be formed and shaped by his grandparents.
What do I do? She's well aware (and loathsome) of my atheism. I don't pray at dinner, although I don't stop it and I don't go to church for any reason (unless sometimes to my parents' Episcopal church for rare occasions...I don't really mind the Episcopals). But, we have a 1 month old daughter...eventually she's going to be a toddler and there will be talks of church and Sunday school. I have no clue what the fuck to do without sacrificing my relationship with my girlfriend in the process. There's no way I can let her go to church without protesting. I can't sit quietly for this. But, I don't want to sacrifice our family over it.
Any advice?