Augustine and a clear exposition of original sin was in the late 4th-early 5th century, about four hundred years after the Roman Empire had already effectively integrated quite a bit of Europe and Asia into a diverse and sophisticated civilization that wouldn't be seen again for another millenia.
Around six hundred years after Augustine, Europe had William the Conquerer and the Holy Roman Empire, I guess? Five hundred years after that, Europe had the Renaissance based in a reclamation of the heritage of the ancient world.
I don't think original sin did a very good job of achieving the integration of anyone.
https://en.m.wikipedia.org/wiki/Original_sin says "The belief began to emerge in the 3rd century..." which is early enough to establish mild causality for Emperor Constantine. Remember, he didn't have to believe it only to suspect that it would be useful.
The whole thing was meant to be tongue in cheek. :)
I unironically believe that the emergence of "political correctness" in America in the 1960s-1980s and it's disappearance as a political force in 1991 and its reemergence as "social justice" in 2012 both stem from "active measures" originating with the KGB/FSB.
"On the other hand -- and this is the other side of the Soviet intelligence, very important: perhaps I would describe it as the heart and soul of the Soviet intelligence -- was subversion. Not intelligence collection, but subversion: active measures to weaken the West, to drive wedges in the Western community alliances of all sorts, particularly NATO, to sow discord among allies, to weaken the United States in the eyes of the people of Europe, Asia, Africa, Latin America, and thus to prepare ground in case the war really occurs. To make America more vulnerable to the anger and distrust of other peoples.
"In that sense, the Soviet intelligence [was] really unparalleled. ... The [KGB] programs -- which would run all sorts of congresses, peace congresses, youth congresses, festivals, women's movements, trade union movements, campaigns against U.S. missiles in Europe, campaigns against neutron weapons, allegations that AIDS ... was invented by the CIA ... all sorts of forgeries and faked material -- [were] targeted at politicians, the academic community, at [the] public at large. ...
"It was really a worldwide campaign, often not only sponsored and funded, but conducted and manipulated by the KGB. And this was again part and parcel of this campaign to weaken [the] military, economic and psychological climate in the West."
The description of movements funded basically fit the entirety of the New Left coalition of the 60s-80s and the current politics of the Extremely Online set typically found on places like reddit, tumblr, 4chan, and twitter.
Given what's been released of the Mitrokhin archive ( https://en.wikipedia.org/wiki/Mitrokhin_Archive ), the Mueller report re: "Russian troll farms" (e.g. the Internet Research Agency), social media disinformation campaigns (e.g. https://help.tumblr.com/hc/en-us/articles/360002280214 ) and pre-Putin-takeover transparency of ex-KGB officers, I don't think it's farfetched to say that Russia and the FSB currently have the means, methods, and motivation to inject any and all corrosive ideologies and misinformation possible in order to paralyze and disintegrate American society.
The Mitrokhin archive (allegedly) and other extant primary aources contains blueprints for these kinds of active measures, including inciting a race war in the US by blowing up a historically Black college and blaming it on right wing militias (Operation PANDORA) and using Soviet media fronts to claim AIDs was made in American-funded biolabs (INFEKTION or VÖRWARTS II):
"We are conducting a series of [active] measures in connection with the appearance in recent years in the USA of a new and dangerous disease, "Acquired Immune Deficiency Syndrome – AIDS"…, and its subsequent, large-scale spread to other countries, including those in Western Europe. The goal of these measures is to create a favorable opinion for us abroad that this disease is the result of secret experiments with a new type of biological weapon by the secret services of the USA and the Pentagon that spun out of control."
This isn't to say that it's impossible that the last decade in America has all been the fruits of American miseducation and inherent civil contradictions coming home to roost, but Occam's Razor and available evidence suggest otherwise--that the Russians currently and historically fund, sow, and amplify any division whatsoever in America that leads to disintegrating social fabric and institutional decline.
"[...] Subsequent pontiffs continued to exhort the episcopate and the whole body of the faithful to be on their guard against heretical writings, whether old or new; and one of the functions of the Inquisition when it was established was to exercise a rigid censorship over books put in circulation. The majority of the condemnations were at that time of a specially theological character. With the discovery of the art of printing, and the wide and cheap diffusion of all sorts of books which ensued, the need for new precautions against heresy and immorality in literature made itself felt, and more than one pope (Sixtus IV. in 1479 and Alexander VI. in 1501) gave special directions to the archbishops of Cologne, Mainz, Trier and Magdeburg regarding the growing abuses of the printing press; in 1515 the Lateran council formulated the decree De Impressione Librorum, which required that no work should be printed without previous examination by the proper ecclesiastical authority, the penalty of unlicensed printing being excommunication of the culprit, and confiscation and destruction of the books. The council of Trent in its fourth session, 8th April 1546, forbade the sale or possession of any anonymous religious book which had not previously been seen and approved by the ordinary; in the same year the university of Louvain, at the command of Charles V., prepared an “Index” of pernicious and forbidden books, a second edition of which appeared in 1550."
There is a very small escalation needed to make the jump from the concept of collective negative liberty ("freedom from disease") to involuntary treatment resulting in Nazi-aligned pogroms for collective hygiene. That step is typically cloaked with good intentions and then used mercilessly without compunction by any inheritors of the system.
Also, in the real non-hypothetical world, the previous forced vaccination campaigns were the precident that lead to Buck v. Bell and forcible eugenic sterilization of people deemed unfit to have children in the USA. Which, in turn, directly inspired Adolf Hitler and the Nazis. Back in the day the ACLU used to be opposed to forced vaccination for exactly this reason (including arguing that forced vaccination for smallpox was an unnecessary and counter-productive attack on civil liberties). As far as I can tell the people involved changed their minds for purely partisan reasons; there is no intellectual justification to go from there to supporting mandatory Covid vaccination and they gave none. If I remember rightly it was literally the exact same folks that argued doing so was immoral for smallpox, and their entire argument when Covid hit was just that it was obvious mandatory vaccination actually defended people's civil liberties...
Eugenics deliberately harms individuals in favour of society(I do not believe in this it favours society), but vaccines never are given with no known harm intended. In fact to the best of our knowledge we avoid given them when we know people might be harmed. I am sure you can recognise there is a very clear difference.
If you deny the possibility of forced vaccination on top of abundance of caution due to archaic examples then you will never trust progress.:)
Around six hundred years after Augustine, Europe had William the Conquerer and the Holy Roman Empire, I guess? Five hundred years after that, Europe had the Renaissance based in a reclamation of the heritage of the ancient world.
I don't think original sin did a very good job of achieving the integration of anyone.