I bit my tongue as well and posted a bland post that attempted to be supportive but do what you want, you could even fight for your emancipation and take them to court and make the arguement that your parents cannot restrict your access to your possessions if you paid for them. The God Delusion is a great book and I own a couple of copies myself, but this doesn't seem like the venue nor did it sound like you were questioning your own stance regarding religion, just frustrated that you are pressured to attend groups by your parents. Best of luck with whatever you decide to do.