Your parents, sadly, are not a credit to atheism. Their heavy handed, authoritarian approach is weirdly similar to that of religious parents who try to force their atheist children to be religious. And that is not in the true spirit of atheism. Atheism is not based on coercion, it is based on logical reasoning. Your parents should have discussed the matter with you reasonably, as Aaron later did, rather than trying to punish you for having opinions they didn't agree with.

So, can your parents be forgiven? I would be inclined to think they can be. We are all imperfect people, and we all make mistakes. Your parents were, in their own clumsy way, only trying to be good parents, and to raise you as a rational child who is not burdened by religious delusions. Unfortunately they did not really know how to do it. But my feeling is that you should give them another try. You no longer have any disagreement about religion to deal with. You are all on the same page now. So pay them a visit, let them feed you dinner. With any luck, it will be delicious.