Heya Jack, welcome to the forum
I'm sorry to hear about the problem with your parents. People have already given lots of good advice. I would come down on the side of either playing along until you can get out and become independent, or just saying you don't want to talk about religion with them. It's a matter of weighing up the benefits and costs of what you say, and how far you go. With the second option, you may be able to get away with this without having to outright state you're an atheist. Hopefully they would respect your request that religion not be discussed with you, at least.
I hope it works out for you. It's not fair that anyone has to put up with this crap from their parents. But sadly they have the power to make people's lives very difficult in response to things they don't want to hear.

I hope it works out for you. It's not fair that anyone has to put up with this crap from their parents. But sadly they have the power to make people's lives very difficult in response to things they don't want to hear.
Feel free to send me a private message.
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Please visit my website here! It's got lots of information about atheism/theism and support for new atheists.
Index of useful threads and discussions
Index of my best videos
Quickstart guide to the forum