When someone asks me why I choose to not believe in a god or gods my reply is that it is not a choice. It is mearly a conclusion based on experience and knowledge. They tell me that it is a choice and that something bad happened to me to make me give up believing and that deep down I know that there is a god and my anger will subside and I will come around. So, I ask them if it is a choice, then I challenge them to not believe for 5 minutes. They always, 100% of the time, get huffy and say no, I am not doing that, I am not choosing to not believe. I ask them why and they say because they don't want to do that. I reply, it's not that you don't want to, it is because you can't, because it isn't a choice. Then they change the subject, always, this is how the conversation goes.