Those in the know understand that imperial antiquity, late antiquity and early medieval ages are largely the same. This means between five to seven centuries have been unnecessarily stitched onto western (and later global) chronology like a fleshy pseudo-penis onto a transdike's flabby loins.

Medievalists also know about a peculiar catastrophe somewhere between 900-1000.
Everybody loves to talk about global warming and every historical jew shit gets its own climate narrative. The don't even care what it's saying as long as somethingsomething climate ("mongols invaded because global warming gave them access to more food resources- no, it made them hungry and desperate").
The tenth century left a thin layer of black soot everywhere you dig deep enough. It's rather possible that this ended the old world.

It would mean that Europe, not the most fertile place, was starving on a grand scale. War everywhere.
In the vacuum of collapsing kingdoms the first European globohomo was established. We know that semi legendary (because their accounts are embellished as fuck)kings like William the conquerer of Charlemagne brought jews in their retinue.
Coin was very rare and kings had extremely poor methods of taxation. This can't be stressed enough for history normies. A standing army was therefore impossibru and it took centuries for these two issues to change. So you either had an unreliable classic feudal/clan/banner system or you had a jew who gave you indirect access to both soldiers and, in the time of crisis, food.

Christians who really were mostly semites at that point came into a dynamic warzone as, in modern terms, advisors. The notoriously poor soldiers kings were often unable to pay. Jews had no problem to step up and become their tax collectors.
We know from Egypt that they already helped establish an 100% astroturfed, syncretic cult which would help make the plebs more managable.
And this is what ultimately happened to Aryans with (((christianity))).