This is mainly for those of you under 18/still living at home, though it can obviously be applicable to older people, as well.
How many of your parents know that you're an atheist?
My mom and step-dad are both very fundamentalist Christians, and as far as they know, I am as well (I sort of stopped doing all that about the time they moved a state away and I moved in with my dad). I don't want to deal with the huge falling out I know would occur were I to tell them. They might also try to make me move in with them again. Plus, to be honest, I need their support and help right now (and especially next year, when I start college), and I know that would all be withdrawn if they knew I'd "turned away from god."
My dad, on the other hand, while he does believe in god, is not any sort of religious person. I don't know if he knows whether I'm atheist or not, but he wouldn't really care either way.