There are between 30-50 specific warnings spread out in the Bible concerning the faithful about false teachers.  False teachers is how fake Christians can seem by  outsiders as the same type of people as real Christians and mistakenly bring down condemnation to the whole lot of us.  There are also demon possessed people in the Bible story left and right worth paying attention to that I suspect sometimes are analogy to the adherents of false teachers.  Amongst the demon posessed was Mary Magdalane, whom Jesus rescued, regressed, and rescued again but still was fond of and held in high regard amongst all the first twelve male apostles.  Knowing this, to me, encourages me to plumb these supernaturally implausible for wisdom, for its precisely the supernatural aspects of it that make it so hard to take at face value and miss the teaching.  As Mary Magdalane was basically the 13th apostle, so having something afflicting 1/13th of the apostles means its not as uncommon as we think.  If we do think demons in the Bible are leftovers from obsolete knowledge even to the Catholic church, I've got bad news considering the author (God) knows about humans.  If the stories of demons in the Bible are an impasse for you, it may mean its precisely those that need unpacking the most in the modern era via personal revelation using the actual scriptures.   Don't just take my word for it, try reading some, but don't forget laying the groundwork by not reading the rest too.  Sometimes missing universal consensus on what the stories symbolize just mean its fruits are yielded in a more personal context of your own friends, communities, and internal struggles.  Substitute meaning of "demon" to something with similarity gravity of evil that fits the stories.

Consider also the Bible's often used symbolism that swaps "swine" for "unbelievers" and hold onto that thought for a moment.  We've all heard the Matthew 7:6 verse warning against giving wisdom to unbelivers.  (Do not cast your pearls before swine...) Exorcist movies also have a trope, rooted in some real Catholic teachings, about priests beckoning forth demons out of the posessed into an actual pig, the demon is fooled and possesses the pig and then the pig is immediately killed with a shotgun.  I think I even remember a Russel Crowe movie replaying that in my head.  Its kind of funny how in those pop stories, its always a Catholic priest whos called– the Protestant pastors from Sunday school just doesn't vibe well as a character hero with the authority necessary to cast out demons.

Another curious take common on the Hollywood rendering on exorcism is how the priest must speak very boldly to the demon possessed, and relies much on his religious iconography, nearby Bibles, and crucifixes.  I don't think the entertained masses here understand the truth of whats really being represented with it.  You see, when someone speaks boldly in the church on the doctrines, truth, or wisdom it does not comes out with conviction amongst us laity.  After all, we emphatically embrace the analogy of ourselves as a flock of sheep who strive to be nurtured and trained our capacity to pursue humility.  Because of this, the learned priests come of as thundering, leading voices worthy of our holding onto our leads in comparison to our own.  These priests are human though too, skilled in the art of humility that they often cannot expose to us anxious sheep lest we scatter from the shepherd.  Priests and the learned rely on praying, Bible reading, and their crucifixes to maintain themselves with the essence of the true, external sources of their convictions: God and Jesus Himself.  

Try it sometime and see for yourself as it works on you too.  Literally, touch base with Jesus via the reminder of him on his crucifix, making the sign of the cross,  using actual scripture from the Bible to supplement yourselves into the bending of your will to His, whom will take control of your voice, use your own words, and speak through you.  Saying something true and wise and presuming it your own feels unnnatural, so through your humility, you give the credit to God and proclaim something that nearby unbelievers find weird and creepy, but its what we do, know, and can recognize fake performances of.

Now back to the another hard to grok part about the wisdom in exorcism: demons.  They don't have to be interpreted literally like pop culture storytellers do, they can be dramatic stand-ins for somebody who is afflicted with a bad teaching that appeals to the flesh, and betrays the true, Good and divine spirit of the person.  Things rooted in the carnal emotions of anger, lust, and envy perhaps.  The beauty of the Bible using "demonic possession" also serves as a convenient mercy to give to the person, for presuming its effects over the actions of the possessed do not condemn the person performing them, they are yet, but only temporarily, "external".  It gives us a nice clean cleavage point for the bad teaching to be removed and the redemption of the person's "true colors" as they are given an escape hatch back to eject the bad idea that was feeding on the flesh's desire of being sanctified in pursuing sin.  Basically, demons can be the equivalent of a mind virus, in a more exaggerated form that may assist wisdom about it standing out to readers.   In the modern world, demons could be the zealotry inducing, evil but viral moral ideals that are in disagreement or downright war against God's words.  The priest's boldness can rattle loose a little escape hatch back to mercy and grace if the possessed suppressed true nature can make a sudden comeback and chose it or drop it.  But it does have to be chosen I feel, and quickly before the demonic idea subsumes the persons identity into something else.   Choosing new names or returning old ones is Bible symbology for this.  Mary Magdalene was also called Lilith when she was in the demonic personality.  Sometimes, it can be so tragic, that even a mother fails to recognize demon from son, and in condemning the son, brings the demon to full authority over the personality.  I know of a tragic case of this happening to somebody I used to know.  Don't let demons change your "true colors".  Follow Jesus example and his example only.  We're more suggestible to evil than we think.

Which all brings forth a subtle wisdom when you consider the priest's beckoning the demon into a pig.  What I believe is being suggested is for person possessed by some bad teaching to try to tempt her to proselytize the lowest form of human in the Bible.  A swine.  A unbeliever.  Unbelievers are then encouraged to hear the bad teaching in the exorcism room, consume it complete, (which they do readily because they are so spiritually empty),  and resume the debate with the demon's fight against God and priest.  The original possessed, being a proud new prosyletizing bad teacher of the unbeliever/swine, sits idle for a moment while the priest outmatches the swine with triviality.  I believe a sort of 3 person debate play is being advocated in the parable.  

Here's a more mundane and less scary rendering of the exorcism room.  Person A (the possessed) gets infected from a false teacher to a bad idea that stirs his passions and picks a fight with Person B (the priest) who advocates specifically against that bad idea, using what he can evoke of God's wisdom, which doesn't always get anywhere.  We've been there and recognize this sort of head butting match between the stubborn that reaches an impasse.   Person B then tempts Person A to try his hand at convincing Person C, a simpleton.  Person A, satisfied he has fully convinced the simpleton of his evil teaching, lets him resume his debate with the priest as a tag team which invariably goes wrong when the priest kills the swine/simpleton (e.g. makes him a new believer) and voila, the originally posssessed concedes the false wisdom that nearly destroyed him.

I see analogy to witches as a cabal of false teaching women, eventually becoming self-aware of how their superpowers of empathy combine when each of them sharing manipulative assistance to proselytize and convert personalities at times of maximum vulnerability.  The Bible teaches we are most vulnerable the farther we are from His grace, which leaves the room the more you sin or think about sinning.  Your ears start itching and even internet hive-minds mobilize to receive.  Especially poignant after reading this line in one of scriptures about false teachers preferring women to begin with:

For among them are those who creep into households and capture weak women, burdened with sins and led astray by various passions.  2 Timothy 3:6

There is no better way to spread bad teaching than by using women against women in the guise of offered comfort and encouragement, because nobody male quite understands their thinking and their idealogical vulnerabilities as does other bad women with lived experience, or even a friend group of other bad teacher women bearing assorted bad fruits of their own (bible speak for life's public evidence of Goodness).  Anyone male who notices this pattern externally would be condemned of sexism in the modern public square, but I insist here that we are all equally harmed and causing harm spiritually, its just that I do believe women's innate gentleness and nurturing make them targetted first in the attempted cultural sanctification of bad teachings going on now and likely since Adam and Eve original sin. (The devil got first to Eve, remember? but they both ate the apple and both were punished)

At any rate, the world inevitably follows God's will whether its fought against or not.  I'm trusting in God in all things nowadays, so I don't mind if this article gets me labeled as sexist or advocating bringing back witch burning.  Even uncomfortable history has lessons the deeper you try to think and empathize with everybody.  Love your enemies and love thy neighbor as thyself for "empathize, understand, learn deeply" is the real synonyms to the original Bible greek use of the word "love" in that verse we all know and recognize intuitively.