Why don't most churches teach people how to cast out demons like Jesus did?

Maybe because they haven't made up the ritual yet=)

Casting out demons is dangerous no matter how you look at it. The "exorcist" (for lack of a better word) must be both a child of God, and clean.

People can shout to someone "OUT FOUL SPIRIT!" but if demon(s) don't know you, they'll attack (or rather cause the person they're possessing to attack.) This happens in the book of Acts; where a couple of people go around casting out demons. When they arrive at one demon possessed man, the demon says, "Jesus I know, and Paul I know, but who are you?" The pair is attacked, and beaten.

If you do not authority from God, then the demons won't listen to you.

Casting out demons is not the prime objective of the church, it is to go and make disciples. If one posessed with a demon recieves Christ as his Lord and savior the demon has no choice but to leave. Jesus did these miracles to show his people that he was God and that all power in heaven and earth was given to him. This same power is in the proclimation of the Gospel to the salvation of men. Casting out demons is not salvation. If an unlean spirit is gone out of a man he can return and bring with him other demons and that person would be worse than he was before. Jesus did not tell us to go out and cast out demons.

May be the church leaders doesn't know how to drive out demon. Also please note that it is not something that can be learned from the seminary or bible school. The one who want to know how to drive out demon must live with someone who drive out daemon and learn from him. He should lead a spiritual life. It is with the power of Holy Spirit and faith in Jesus that drive out demon. An ordinary person with the power of Holy Spirit can do the same. It is a gift of God.

Honestly, I think that many churches tend to stay away from overtly "spiritual" things both good and bad. Most of us would rather learn how to deal with our personal problems, like "how to be a good spouse", or "how to raise kids"...those types of issues appeal to us more than deep issues of the spirit. These human problems, at the heart of them are "spiritual", but we usually will take more of a "psychological" approach to the problem. This is one reason I think that many problems stay unresolved because we fail to include the spiritual side of things.

Some of the churches that do deal with these types of issues are often so "over focused" on the spiritual world- especially the demonic- that it becomes a spectacle or a carnival show. It makes for an exciting "show". The glory is given to the "minister" who smacks the guy on the head, instead of giving glory to God who heals and delivers. In the end--the world discredits Christians as being a bunch of wack-a-doddles.

Demon possession is impossible for a follower of Christ as it is God's spirit that resides in us. We can, however, be harassed by demonic spirits. In that regard, we stand on our authority as a child of God and the demons have no right to harass us. We need to recognize when this happens, however, and stand in our authority. Sometimes we miss this as the heart if the problem.

If someone is a non-believer and you cast out the demons-- they will often come back if that person doesn't become a Christian.

Luke 11:24-26

"When an evil spirit comes out of a man, it goes through arid places seeking rest and does not find it. Then it says, 'I will return to the house I left.' When it arrives, it finds the house swept clean and put in order. Then it goes and takes seven other spirits more wicked than itself, and they go in and live there. And the final condition of that man is worse than the first."

The best way to drive out a demon is permanently by the indwelling Holy Spirit.