It's interesting that Christians, Muslims and other religions recognize demonic possession except for the Jews. Judaism doesn't teach of a "devil" in the traditional sense, but rather Satan is an angel deputized by God to test people's faith. They believe if it exists, it's linked to the dybbuk, a disembodied wandering spirit that enters and possesses the body of a living person until exorcism. This would add light to the verse where they accused Yahusha called Jesus Christ of having a Devil or asking the question, are you Elijah? Satan to the Jews, is an angel deputized by God to test people's faith. First let's investigate Hell, also called Sheol.
"For the living know that they will die, but the dead know nothing, and they have no more reward, for the memory of them is forgotten. Also, their love and their hatred and their jealousy have now perished, and they no longer have any share in all that is done under the sun." Ecclesiastes 9:5-6.
So the question is, why would dead people haunt the living? The Spirit of the dead human is sent to Hell according to the "Qoheleth," a book of wisdom in the Hebrew Bible.
The Jews answered and said to Him, “Do we not say rightly that You are a Samaritan and have a demon? Jesus answered, “I do not have a demon, but I honor My Father, and you dishonor Me. But I do not seek My glory; there is One who seeks and judges. John 8:48-50
According to the Jews, Yahusha was to have a Spirit of a dead human, influenced by Satan to test their faith. They totally ignored the prophecy of the coming Messiah .
Then a shoot will spring from the stem of Jesse, And a branch from his roots will bear fruit. The Spirit of Yahuah will rest on Him, The spirit of wisdom and understanding, The spirit of counsel and might, The spirit of knowledge and the fear of Yahuah. And He will delight in the fear of Yahuah, And He will not judge by what His eyes see, Nor render a decision by what His ears hear; But with righteousness He will judge the poor, And decide with uprightness for the afflicted of the earth; And He will strike the earth with the rod of His mouth, And with the breath of His lips He will put the wicked to death. Also righteousness will be the belt about His loins, And faithfulness the belt about His waist. Isaiah 11:1-5
These Invasive Spirits so far are the dead human hybrid children of fallen Angels, not purebred humans. More information can be found out in the book of Enoch, third chapter. Above the demons are the fallen Angels, above them is the fallen Cherub Heylel BenSahar.
I quote, "Freud, has drawn parallels between dybbuk possession and hysterical syndromes suggesting a psychological basis for the perceived symptoms."
"Hallucinations, extreme unrest, and altered behavior, can also be indicative of various mental health conditions," as the medical diagnosis would tell it.
Speaking in tongues is considered schizophrenia or dissociative disorder. But the question is, how can scientists proclaim this if they cannot measure the Spiritual World if they are limited to the physical world? When in contact with a Spirit, it is said to be unexplained physical phenomena or psychological effect of something or someone.
The question is, how do you prove that there is a spiritual world and spiritual warfare? For the unbeliever, if there is a spiritual battle going on, the Evil side would spread propaganda that there is no spiritual world, it's all fantasy or a medical condition. To prove to you that there is a spiritual world, it's not looking at the ugly, but look at the peaceful.
But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control. Against such things there is no law. Now those who belong to Messiah Yahusha crucified the flesh with its passions and desires. If we live by the Spirit, let us also walk in step with the Spirit. Let us not become those with vain glory, challenging one another, envying one another. Galatians 5:22-26
Simply said, people who don't challenge or envy other people is proof a spiritual world. In other words, being patient or kind is not natural. What is natural is sexual immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, selfish ambition, dissensions, factions, envying, drunkenness and carousing.
Back to the Invasive Spirit, the question is, what is in it for them if the take over a living human? The mind of the Host body will struggle to remain in control. If the Host trys to make peace it, it's like the Host is dead already. Attacking the problem medically or with a psychologist, the in problem is managed, not fixed. The Host needs to be cleansed of the Invasive Spirit or Spirits. Then the Host needs to be born again. This is an upgrade from a spirit that yeilds to things of the flesh to a Spirit that invites the Holy Spirit in. To answer the question, an Invasive Spirit wants a Host with a dark heart and soul that will not put up a fight when the Invasive Spirit needs wicked perverted actions. By being Born Again, the Host is full of Spiritual Light where Darkness cannot be in.