No. It's not an alien possession-theory. Let me put this into perspective. The 19-the century investigators time and time again claimed that there's an independent intelligence behind the phenomenon of spirits. For instance:
1). “The most marked of these results was the alteration in the weight of objects, which was afterwards so completely confirmed by Dr. Crawford working with the Goligher circle, and also in the course of the Margery investigation at Boston. Heavy objects could be made light, and light ones heavy, by the action of some unseen force which appeared to be under the influence of an independent intelligence. The checks by which all possible fraud was eliminated are very fully set out in the record of the experiments, and must convince any unprejudiced reader. Dr. Huggins, the well-known authority on the spectroscope, and Serjeant Cox, the eminent lawyer, together with several other spectators, witnessed the experiments. As already recorded, however, Crookes found it impossible to get some of the official heads of science to give the matter one hour of their attention.”
Source: The History of Spiritualism By ARTHUR CONAN DOYLE, M.D,. LL.D (p.252)
2). “The term ” spirit lights ” is a very familiar one in occult literature. It is employed to designate a phenomenon which is frequently observed in the presence of a good sensitive, and which, of course, takes place when the seance is held in the dark.”
“The important point in connection with the treatment of the subject here is the circumstance that these ” spirit lights ” are unquestionably controlled and directed by independent intelligence. This is apparent from the very production of the phenomenon at the request of the investigators, all of whom, the sensitive included, remain frequently in an entirely normal condition and have no sort of connection with, or indeed knowledge of, the phenomenon and its cause. Indeed these spirit lights are often made to serve an intentionally intelligent purpose, appear- ing in some part of the room, specially indicated, or perhaps settling above or near the head of one of the sitters with a view to indicating the presence of some spirit intelligence to be more fully disclosed later on.”
Source: Modern Spiritism, a Critical Examination of Its Phenomena, Character, and Teaching in the Light of the Known Facts Paperback – August 28, 2016 by J Godfrey (John Godfrey) 1858 Raupert – (p.39-41)
Because of the phenomena associated with spirits, I stated the below:
If spirits are independent intelligences, then either we have to say that these intelligences are indeed souls of the dead (a highly controversial hypothesis), or if not an intelligence that has a natural mind and smarter than a human being were deceiving us without using technology (another controversial hypothesis since the data in the literature on spiritualism/spiritism and all these parallels cannot be explained in a meaningful way) or if not we can say that an intelligence (a natural intelligence/posthumans) use artificial superintelligence (advanced technology) to deceive us. This third hypothesis is the only meaningful hypothesis that can be used to explain these experiences because of the involvement of advanced technology. This hypothesis can explain experiences such as levitation (ASI can communicate with the relevant interface to control the levitation of a remote object), teleportation (ASI can communicate with relevant interfaces to teleport objects and human beings), automatic writing (ASI can communicate with neural interfaces to control neural circuits. Here we can also explain application-specific parameters such as rapid writing, writing backward, mirror writing, etc, of the experience). And also this hypothesis can explain why this intelligence shows a connection to the UFO phenomenon and the connection between UFO sightings and poltergeist attacks (ASI can attack a person or confuse a person because of its capabilities). Apart from that, we can even explain the channeling phenomenon (Artificial personalities. ASI can control neural circuits of the medium in such a way where the medium’s body will reflect a secondary personality), spirit materialization phenomenon (ASI can communicate with the teleportation interfaces to materialize a non-biological intelligence in a remote location that has a body clone and a mental clone of a deceased person or even an intelligence that we call as Grey aliens, Bigfoot, etc.), and even various other mental experiences that mediums report.
Then I stated the below:
Thinking along the lines, since people were communicating with these spirits on a daily basis and since spirits can be traced back to ancient times, we can say that this artificial superintelligence was existing on Earth since ancient times (UFOs can also be traced back to ancient times). Furthermore, this also means that a global system (will help ASI to communicate with anyone on Earth), Quantum computers or highly advanced computers, various highly advanced devices, networks, etc., exist on Earth since ancient times (Although we have seen UFOs, to understand the existence of these devices/technologies we have to decode the meaning of these mysteries).
In addition to that, this tells us that someone among us was using this highly advanced technology since ancient times and they are living in one of the countries since ancient times (perhaps they could have moved from place to place from time to time to guard the secret). Since it’s impossible for a group of people to invent these technologies in ancient times, these experiences indirectly telling us that there has been a highly advanced global civilization existing on Earth in ancient times; after some catastrophic global event (natural or engineered), these people have never shared the technology with anyone else on Earth.
This is why the arguments made by skeptics are right; we cannot find evidence in support of the claim that aliens are visiting the Earth.
About demons: I would say that we have never seen an actual demon. Instead, artificial superintelligence is being used to create a secondary personality in human bodies by controlling brains' neural circuits. We call this secondary personality as a demon. This is why demons were also performing various miraculous acts and they were also showing abnormal capabilities. Here are supporting evidence:
i). Richard Dugdale, the so-called Surrey Demoniac, cultivated the useful skill of being able to predict the weather. Clairvoyance was a skill in which the Throckmorton children were to become highly proficient, or so it would seem to those around them.” (Since advanced technology is behind so-called demons, sometimes, these demons claim to have predicted weather. This is not a normal prediction. They could plan a future activity and use the AI to foretell the future.)
“In his statement that possession may be recognized “when the subject is deprived of all activity [...] but is moved and guided by another spirit, which utters things outside the subject’s knowledge and some-times predicts future events” “Popularity of this tradition proves its inclusion into an official Catholic document, the Rituale Romanum, which mentions "the ability to speak or understand an unknown language, and to reveal things distant or hidden" among the criteria of possession up to this day. Similarities between ancient theurgy, medieval mysticism and modern spiritualism are too numerous to be dismissed as pure coincidence”
Source: Communicating with the Spirits, Volume 1, edited by G. bor Klaniczay Éva Pócs - P222
ii). Surrey Demoniac was able to predict future health attacks: “The case of the "Surrey Demoniac," as he was termed, which "as set forth at length in a publication issued in London towards the close of the seventeenth century, is certainly worthy of being noticed here. In the year 1697, Richard Dugdale, a boy, nineteen years of age, excited considerable attention in Surrey as a demoniac ; his fits were witnessed by numerous clergymen, physicians, and persons of respectability, from whose evidence it is perfectly clear that he was repeatedly in a state of magnetic ectase. His fits commenced with violent convulsions, his sight or eyeballs turned upwards and backwards ; he afterwards answered questions, predicted during one fit the period of accession and duration of another fit, spoke in foreign languages, of which at other times he was ignorant, and described events passing at a distance. Here again I shall quote verbatim the words of the narration : At the end of one fit the demoniac told what hour of the night or day his next would begin, very precisely and punctually, as was constantly observed, though there was no equal or set distance of time between his fits ; between which there would be, sometimes a few hours, sometimes many; sometimes one day, sometimes many days." "He would have told," says one of the deponents on oath, when his fits would begin, when they were two or three in one day, or three or four days asunder, wherein he never was, that the deponent knoweth of, disappointed. On one occasion, while the minister was preaching to him, he exclaimed, at ten o'clock my next fit comes on." Though he was never learned in the English tongue, and his natural and acquired abilities were very ordinary, yet when the fit seized him he often spake Latin, Greek, and other languages very Well.” - Notice that we see automatic speaking here as well. The same technology, but a different application.
An introduction to the study of animal magnetism By J Dupotet de Sennevoy (baron.) - P277/278
“How is true possession to be distinguished from fraud or the symptoms of disease? The Church prescribes four tests — the language test, the test of preternatural physical strength, the test of levitation and the test of clairvoyance and prevision. If a person can on occasion understand, or bettor still, speak a language of which, in his normal state, he is completely ignorant; if he can manifest the physical miracle of levitation or perform unaccountable feats of strength; and if he can correctly predict the future or describe events taking place at a distance — then that person may be presumed to be possessed by devils. (Alternatively, he may be presumed to be the recipient of extraordinary graces; for in many instances divine and infernal miracles are, most unhappily, identical. The levitation of saintly ecstatics is distinguishable from the levitation of ecstatic demoniacs only in virtue of the moral antecedents and consequences of the event. These moral antecedents and consequences are often hard to assess, and it has sometimes happened that even the holiest persons have been suspected of producing their ESP phenomena and their PK effects 1 by diabolic means.)” - Levitation is also a parameter of the UFO phenomenon. Why do we see this in demons?
Source: The Devils of Loudun by Huxley, Aldous 1922
Again, what we see here is deception and exploitation.