What's very interesting is that a number of secular researchers (including Dr. John Mack, who has a Pulitzer prize in his background) came to the conclusion that evidence exists, not for extraterrestrial life, but
interdimensional.
Here are some quotes:
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."
- Jacques Vallée
“The conclusion I’ve come to after all these years is that first of all, the subject is much more complex than any of us imagined. It has paranormal aspects but certainly it has very real physical aspects, too.” “[The extraterrestrial] theory runs up against a very big difficulty, namely, that we are seeing too many UFOs. The Earth is only a spot of dust in the Universe. Why should it be honored with so many visits? … I am more inclined to think in terms of something metaphysical, a sort of parallel reality.”
-Dr. J. Allen Hynek
“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.”
- John E. Mack, M.D
"A large part of the available UFO literature is closely linked with mysticism and the metaphysical. It deals with subjects like mental telepathy, automatic writing and invisible entities as well as phenomena like poltergeist [ghost] manifestations and 'possession.' 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
“I have watched in dismay as a number of respected UFO researchers moved from a physical to a parapsychological interpretation of the bizarre UFO phenomenon….now I [too] am being forced to reexamine the UFO phenomenon in light of its apparent paraphysical nature.”
-Raymond E. Fowler: “The Watchers: The Secret Design Behind UFO Abduction;” (New York: Bantam 1991) pp. xv, 183
“The ‘medical examination’ to which abductees are said to be subjected, often accompanied by sadistic sexual manipulation, is reminiscent of the medieval tales of encounters with demons. It makes no sense in a sophisticated or technical or biological 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 shorter time with fewer risks”
- Jacques Vallée Confrontations - A Scientist's Search for Alien Contact; pg. 13
"We are dealing with a multidimensional paraphysical phenomenon which is largely indigenous to planet earth."
- Brad Steiger
"The UFO manifestations seem to be, by and large, merely minor variations of the age-old demonological phenomenon..."
- John A. Keel, UFOs: Operation Trojan Horse, p. 299
"There seems to be no evidence yet that any of these craft or beings originate from outer space."
-Gordon Creighton
"One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships."
-Arthur C. Clarke, New York Times Book Review, 27 July, 1975
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Bottom line? "Aliens" = demons.