How can you be a follower of Satan "without realising it"?

A person is born dead in sins and trespes. This means we are born dead in spirit not able to come to God on our own. A person who is not a Christian is at war or enmity with God. Everything you do for another so called god or to give yourself glory is against God and is for the rebellion of Satan. Satan goes about as a lion looking for who he make destroy. There is no neutral ground. You are for God or for Satan. The people for God will know it. The people for Satan will either know it or they may not. No Christian are in the darkness and do not understand the light. This is how a non Christian could serve the devil and not even know it.