Should atheists all be subjected to an exorcism so that they will serve the Lord?

I am a Christian and I do not agree with your thinking at all. First of all just because someone does not believe in God does not make them possessed by a demon. And also I agree with whoever said 'what about free will?' because God created us to have a choice, and if there is a law to all non-Christians to be exorcised that would be attempting to take away the free will God himself gave to everybody. I really think you should read the Bible carefully cause your thinking is not Biblical at all...