Exorcist have to be Believers

[Acts 19:13] Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the Lord Y’Shua, saying, We adjure you by Y’Shua whom Paul preacheth.
A rebuke to the seven sons of Sceva, the hopeful Jewish exorcists. Then some of the itinerant Jewish exorcists took it upon themselves to call the name of the L-rd Y’Shua over those who had evil spirits, saying, "We exorcise you by the Y’Shua whom Paul preaches." And the evil spirit answered and said, "Y’Shua I know, and Paul I know; but who are you?" Then the man in whom the evil spirit was leaped on them, overpowered them, and prevailed against them, so that they fled out of that house naked and wounded. Was not this a proof that he derived his strength from the evil spirit that dwelt in him?
At that time, there were Jewish exorcists who practiced their "trade" with a lot of superstition and ceremony. Here, a group of itinerant Jewish exorcists try to imitate Paul's "formula" for success.
We exorcise you by the Y’Shua whom Paul preaches: The Jewish exorcists failed because they had no personal relationship with Y’Shua. They only know Y’Shua is the G-d of Paul, not their own G-d.
There are many people - many churchgoers - who will perish in Hell because they have no personal relationship with Y’Shua HaMashiach. They only know "the Y’Shua the pastor preaches" or of "the Y’Shua my spouse believes in" instead of the Y’Shua of their own salvation.
Do you have the "right" to use the name of Y’Shua? These sons of Sceva did not, because they had no personal relationship with Him. “Who are you?" The evil spirit knew exactly who Y’Shua was, and knew exactly who Paul was. But they didn't know who the seven sons of Sceva were. Apparently, evil spirits know who their enemies are, and don't waste their effort knowing those who aren't a threat to them.
The seven sons of Sceva had no real relationship with Y’Shua, they had no spiritual power against the evil spirit. They left the encounter naked and wounded. It was dangerous for them to take the reality of spiritual warfare lightly.
Many who had believed came confessing and renouncing, telling their deeds. Also, many of those who had practiced magic brought their books together and burned them in the sight of all. Ephesus was a stronghold of Satan. Here many evil things both superstitious and satanic were practiced. Books containing formula for sorcery and other ungodly and forbidden arts were plentiful in that city.
Many believers did not know they were involved in the demonic. They see their actions in a far more innocent light, until they knew the reality of the demonic.
These books and scrolls full of magic charms, amulets and incantations were well known in Ephesus, and they were valuable. The drachma was a silver coin representing about a one-fourth a day's wage, and if we estimate 300 working days a year, at an income of $25,000, this amount represented more than $1 million!
Christians must do this also today, removing books, tapes, records, statues, charms, games, or whatever else might have connection with demonic spirits. They should also destroy them so they are of no use to others.
You will have enough temptation in your own mind without going after these things. Is there any habit, any practice that you have got that defiles your soul? If the Messiah loves you, and you come and trust in him, you will make short work of it. Have done with it, and have done with it forever.
The end result will be obviously worth it all!!