While I can see what you are driving at, I cannot go so far as to suggest that all humanity is demonic, or at least in the sense that each_and_every_one is or must be possessed at some level. I DO believe that many, many are in fact possessed- Many more than our society is prepared to admit.
That we are influenced by demonic forces is unquestionable. Combine that to the thought that we are evil by nature (in the milder sense), and one can certainly see why the default "low" in human governance is anarchy. And so we go, ever slouching toward Gomorrah.
That our nation has almost certainly succumbed to the idea that Christianity is a personal thing seals our doom. Western Civilization, and Britain (and her whelps, to include the USA) particularly have succeeded because of a national sense of Christendom. We as nations subscribe to the Judeo-Christian Ethic as a societal sense of right and wrong.
Look not only to the laws written upon the books (which are enough to prove a sure connection to the Hebrew God), but look also to the laws written upon the heart: Note the close affinity between the early Brit concept of "the Stations of a Noble Heart" and the "Cowboy Code (Code of the West)" or the "American Way".
That societal norm is why kids here have been raised up to be good men and good citizens, and why for the longest time we could prevail against the evils that beset nations, families, and individuals, and even show progress in the war to bring about the Kingdom (it is all about the Kingdom, after all).
The infection of our society by the rotted root of Rome (by way of the Constitution of the French Republic's bastardization into the Socialist concept) is what makes these ills so prevalent in our nation- The supplanting of Rome's root for our Natural root is the direct cause.
The more that Natural root is cut away from us, the more we are grafted to the unnatural one, and why I can admit with good evidence, a fair subscription to the basis of this article.
Part III. Of a Christian Commonwealth.
Chap. xxxviii. Of Eternal Life, Hell, Salvation, and Redemption.[12] And first, for the tormentors, we have their nature and properties exactly and properly delivered by the names of the Enemy (or Satan), the Accuser (or Diabolus), the Destroyer (or Abaddon). Which significant names (Satan, Devil, Abaddon) set not forth to us any individual person, as proper names do, but only an office or quality, and are therefore appellatives, which ought not to have been left untranslated (as they are in the Latin and modern Bibles), because thereby they seem to be the proper names of demons, and men are the more easily seduced to believe the doctrine of devils, which at that time was the religion of the Gentiles, and contrary to that of Moses, and of Christ.
[13] And because by the Enemy, the Accuser, and Destroyer, is meant the enemy of them that shall be in the kingdom of God, therefore if the kingdom of God after the resurrection be upon the earth (as in the former Chapter I have shewn by Scripture it seems to be), the Enemy and his kingdom must be on earth also. For so also was it in the time before the Jews had deposed God. For God’s kingdom was in Palestine (Israel), and the nations round about were the kingdoms of the Enemy; and consequently, by Satan is meant any earthly enemy of the Church. (Hobbes p 308)
Part IV. Of the Kingdom of Darkness
Chap. xlv. Of Demonology and other Relics of the Religion of the Gentiles[16] And whereas a man can fancy shapes he never saw, making up a figure out of the parts of divers creatures, as the poets make their centaurs, chimeras and other monsters never seen, so can he also give matter to those shapes, and make them in wood, clay or metal. And these are also called images, not for the resemblance of any corporeal thing, but for the resemblance of some phantastical inhabitants of the brain of the maker. But in these idols, as they are originally in the brain, and as they are painted, carved moulded or molten in matter, there is a similitude of one to the other, for which the material body made by art may be said to be the image of the fantastical idol made by nature. (Hobbes, p 444)
Part IV. Of the Kingdom of Darkness
Chap. xlvii. Of the Benefit that proceedeth from such Darkness[1] Besides these sovereign powers, divine and human, of which I have hitherto discoursed, there is mention in Scripture of another power, namely, that of “the rulers of the darkness of this world,” [Ephesians, 6. 12] “the kingdom of Satan,” [Matthew, 12. 26] and “the principality of Beelzebub over demons,” [Ibid., 9. 34] that is to say, over phantasms that appear in the air: for which cause Satan is also called “the prince of the power of the air”; [Ephesians, 2. 2] and, because he ruleth in the darkness of this world, “the prince of this world”:[John, 16. 11] and in consequence hereunto, they who are under his dominion, in opposition to the faithful, who are the “children of the light,” are called the “children of darkness.” For seeing Beelzebub is prince of phantasms, inhabitants of his dominion of air and darkness, the children of darkness, and these demons, phantasms, or spirits of illusion, signify allegorically the same thing. This considered, the kingdom of darkness, as it is set forth in these and other places of the Scripture, is nothing else but a confederacy of deceivers that, to obtain dominion over men in this present world, endeavour, by dark and erroneous doctrines, to extinguish in them the light, both of nature and of the gospel; and so to disprepare them for the kingdom of God to come.
Hobbes, Thomas. Leviathan: with selected variants from the Latin edition of 1668. Ed. Edwin Curley. Indianapolis: Hackett, 1994.
http://oregonstate.edu/instruct/phl302/texts/hobbes/leviathan-contents.html
Part IV. Of the Kingdom of Darkness
Chap. xlvii. Of the Benefit that proceedeth from such Darkness
[21] ...For from the time that the Bishop of Rome had gotten to be acknowledged for bishop universal, by pretense of succession to St. Peter, their whole hierarchy (or kingdom of darkness) may be compared not unfitly to the kingdom of fairies (that is, to the old wives' fables in England, concerning ghosts and spirits and the feats they play in the night). And if a man consider the original of this ecclesiastical dominion, he will easily perceive that the Papacy is no other than the ghost of the deceased Roman empire sitting crowned upon the grave thereof. For so did the Papacy start out of the ruins of that heathen power.
[22] The language also which they use (both in the churches and in their public acts) being Latin, which is not commonly used by any nation now in the world, what is it but the ghost of the old Roman language?
[23] The fairies, in what nation soever they converse, have but one universal king, which some poets of ours call King Oberon; but the Scripture calls Beelzebub, prince of demons. The ecclesiastics likewise, in whose dominions soever they be found, acknowledge but one universal king, the Pope.
[24] The ecclesiastics are spiritual men and ghostly fathers. The fairies and ghosts inhabit darkness, solitudes, and graves. The ecclesiastics walk in obscurity of doctrine, in monasteries, churches, and church-yards.
I totally subscribe to that concept, and almost in those exact words. (I use the word 'demon').
While I can see what you are driving at, I cannot go so far as to suggest that all humanity is demonic...
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I would never suggest that all humanity is demonic. I was only referring to the phrase "feed the beast within".
"Don't feed the hungry demon." It's a phrase I often think of. Our lower self hungers for violence, anger, gambling, drugs, whatever it may be. If you feed these base emotions and addictions, it's like adding fuel to the fire. There's a receptive part within us that, if you keep feeding it, grows. It's how addictions start. You do something once, then again, and again -- and that base addiction within you starts to grow. I can never understand why someone would voluntarily begin to take dangerous drugs such as heroin or cocaine. Why start something that they know is so deadly?