Yes, it is. Normally you have to pay them a lot of money and go through numerous seminars and" personality audits" to learn that.
Demons is not the correct term. They call them "Thetans".
Thetans are the spirits of space aliens who were imprisoned in a volcano millions of years ago by a Intergalactic dictator named 'Xenu".
Most of our personality problems are supposed to be the result of the influence of the Thetans, and some kind of programing from Xenu.
American Freedom of religion occasionally produces some strange things.