Here are some quotes that I said I would post, by well known UFO researchers who, based on years of research, came to the conclusion that 'aliens' are interdimensional, not extraterrestrial. Keep in mind that these are secular researchers, who arrived at these conclusions because of the evidence, not religious beliefs.
“It’s both literally, physically happening to a degree; and it’s also some kind of psychological, spiritual experience occurring and originating perhaps in another dimension.”
— Dr. John E. Mack (psychiatrist, professor at Harvard Medical School, Pulitzer Prize-winning biographer)
"UFOs, although they may have no physical reality, can and do affect matter....the universe is not all that simple. Mystics, for example, have always talked about how matter vibrates at different rates of speed, but the scientist doesn't know what the mystic is talking about....there is a lot that the spaceship concept doesn't explain about UFO phenomena. You have to disallow or neglect and overlook all sorts of things if you accept the idea that nuts-and-bolts craft are coming here from outer space....the so-called extraterrestrial hypothesis....We're going to have to broaden our scope and admit other things into our playing field of science....But it would be wrong if we pursued that path to the exclusion of everything else. If the evidence suggests that there is a paranormal dimension to the phenomenon, we're going to have to pursue that.”
— Dr. J. Allen Hynek (American astronomer, professor, and ufologist)
"The 'medical examination' to which abductees are said to be subjected, often accompanied by sadistic sexual manipulation, is reminiscient of the medieval tales of encounters with demons. It makes no sense in a sophisticated or technical framework: any intelligent being equipped with the scientific marvels that UFOs possess would be in a position to achieve any of these alleged scientific objectives in a shorter time and with fewer risks."
"We are dealing with a yet unrecognized level of consciousness, independent of man but closely linked to the earth.... I do not believe anymore that UFOs are simply the spacecraft of some race of extraterrestrial visitors. This notion is too simplistic to explain their appearance, the frequency of their manifestations through recorded history, and the structure of the information exchanged with them during contact."
"The symbolic display seen by the abductees is identical to the type of initiation ritual or astral voyage that is imbedded in the [occult] traditions of every culture...the structure of abduction stories is identical to that of occult initiation rituals...the UFO beings of today belong to the same class of manifestation as the [occult] entities that were described in centuries past."
"An impressive parallel can be made between UFO occupants and the popular conceptions of demons.” "UFOs can project images or fabricated scenes designed to change our belief systems."
—Dr. Jacques Vallée (computer scientist, former astronomer, ufologist)
“The UFOs do not seem to exist as tangible, manufactured objects. They do not conform to the natural laws of our environment. They seem to be nothing more than transmogrifications tailoring themselves to our abilities to understand. The thousands of contacts with the entities indicate that they are liars and put-on artists. The UFO manifestations seem to be, by and large, merely minor variations of the age-old demonological phenomenon.”
— John Keel
"One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships.”
— Arthur C. Clarke
"Many of the UFO reports now being published in the popular press recount alleged incidents that are strikingly similar to demonic possession and psychic phenomena...."
— Lynn E. Catoe
"...if one sets the three occult groups against the three classifications of UFO entities and their characteristics, it is rather surprising how complementary to each other they appear to be, not only through their appearance, activities, and level of behavior, but also in the quality of mental and, especially, emotional reaction and response that has been noted to have occurred on contact.”
— Ivar Mackay (former chairman of the respected British UFO Research Association)
“We are dealing with a multidimensional paraphysical phenomenon which is largely indigenous to planet earth.”
— Brad Steiger
"Increasingly I felt as if I were entering a struggle that might even be more than life and death. It might be a struggle for my soul, my essence, or whatever part of me might have reference to the eternal. There are worse things than death, I suspected... so far the word demon had never been spoken among the scientists and doctors who were working with me...Alone at night I worried about the legendary cunning of demons ...At the very least I was going stark, raving mad."
"I felt an absolutely indescribable sense of menace. It was hell on earth to be there [in the presence of the entities], and yet I couldn't move, couldn't cry out, couldn't get away. I'd lay as still as death, suffering inner agonies. Whatever was there seemed so monstrously ugly, so filthy and dark and sinister. Of course they were demons. They had to be. And they were here and I couldn't get away."
— Whitley Strieber, Transformation, p. 44-45, p. 181