I'd read online of a few ufo investigators who actively assist alleged abductees in resisting, stopping and eliminating 'alien' abductions, which is the main reason I bought this book. I think the theory that 'aliens' may indeed be what Jews/Christians/Muslims know religiously as "fallen angels" makes sense on many levels. It seems to be as good a theory (even more so perhaps) that the ETH or the PSH. The Fallen Angel idea is the closest to the IDH(or EDH), which the late John Keel and the still very living Jacques Vallee wrote about. Keel even compared ufo activity to the demonic and Keel was not known as a religious man.
The problem I have with this book is the lumping in of a "belief" in evolution[very bad according to the authors] and playing (or even having a blood relative, living or dead) with 8-ball, tarot card, new age ideas or belonging to private organizations like Masons as "opening the door" to fallen angels coming right into your life (at a young age) to abduct you. Also, if you're a mainline Protestant or Roman Catholic, these authors make it pretty clear, you're not "born-again"....you're not the right kind of Christian(I'd assume they think the same about Eastern Orthodox, though they didn't mention it).
One of the testimonies made it very clear to me that the authors have some serious blind spots. A testimonial from someone of Mexican descent blamed alot of alien/ufo activity in and over Mexico(as did the authors) on that country's pagan history of Aztec human sacrifice and that it (Mexico) and its people had not repented of that past. There was a belief written in the testimony of the conquistadores trying to wipe out Aztec sacrifice (as if the invading Spaniards cared about *that* - it was the gold they were after!). But what seemed to fly over the heads (no pun intended) of the testimony and the author's supporting commentary, was that the Spanish invasion and occupation was even more of a blood bath than the Aztecs ever produced. And ,there were the forced conversions to Christianity (though I'm sure the authors don't consider Roman Catholicism to be Christian).
And while on that topic of national sin/repentence and ufo activity , what about the history of our (U.S.) country. Our ancestors committed genocide on the indigenous people and forced conversions (mostly puritan and protestant) on the ones that were allowed to live (who were still marginalized from 'white' society and then still often killed, despite becoming Christian). Then there's the horrible history of slavery! So, you see, there are these blind spots in this book when the authors use sin as an example(whether personal/intergenerational or national/cultural)for ufo/abduction activity in Mexico as it was pointed out in the book, but don't mention it in our nation's past. There's also a definite anti-liberal and pro neo-conservative bent to the authors.[Gosh, I wish ufo authors would keep their personal political biases out of their work - whether right/left/center!]
Still, I think the basic idea that 'aliens' may actually be Fallen Angels is sound. Do we really think a highly advanced, intergalactic species would float through peoples walls, take people against their will, repeatedly performing pointless and painful tests on them [focusing mostly on the genital/anal area] and habitually tell abductees lies? Whatever these entities are, they cause abject fear, real pain and probably premature death.