Not everyone can be an exorcist. Demons all know Jesus and they also know the one that has the authority to call them out. There is no power or magic in the use of the name of Jesus by one that does not know Jesus.
There are many false exorcists. Why is that? What makes people think they can cast out evil spirits? The very same thing that makes witch doctors think they can cast out devils. Witch doctors can manifest powers that are not physical. Some of those same witch doctors think their powers are from a good source. This is part of Satan’s plan to keep confusion going. The Bible says that a house divided against itself cannot stand. In no way can that witch doctor cast out an evil spirit because his own power rests in an evil spirit. The spirit within the host human will cooperate with the spirit in the witch doctor so that, to the physical, it may appear that the spirit has been cast out. In reality, it could not have been cast out.
Demons within a human can talk through their host. They don’t have to answer one who does not have authority, but they are compelled to answer one, on demand, who has the authority. This is an important truth and if you intend to be an exorcist, make certain of your authority; it is a God given gift.
There are those people trying to use the name of Jesus only to find out that the name, itself, holds no magic power. This is another important truth. There is no magic in the use of the name of Jesus. This holds true for the real exorcist also. The use of Jesus’ Name is something we always do, but there is no magic in the use itself. To say His name releases no magical power. The power doesn’t come from the use of His name, but by the authority granted to you by Him! “In the name of Jesus” literally means “by the authority of Jesus”. The demons know this, and they also know the false exorcists are not telling the truth because they do not have the authority in the name of Jesus. This is why demons refuse to obey and come out. They do not have to obey one without authority.
“And the evil spirit answered and said, Jesus I know, and Paul I know, but who are ye? And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded.” (Acts 19:13-16) From this scripture we learn that everyone can not be a “true” exorcist.