Hello, Phizzy, ( and RR).
A week or two back we had crossed paths on another topic discussing Gibbon's "Decline and Fall of the RE" - and I noticed elsewhere that you mentioned you were about to sit down and read Tom Holland's book, "In the Shadow of the Sword". As it turned out, I ran into the same book in a used bookstore and read it as well. Both are pretty good backgrounds for this discussion.
As for myself, I had hit Holland's book right about chapter 40 in Gibbon. Gibbon was discussing events in Justinian's reign and then the abridged paperback edition I had omitted the chapters about Belisarius reconquering the lands lost in the west and kicking the Goths out of Italy and Rome. What the ...?? As I had mentioned, all of Gibbon's text is available on line - so whatever he said can be found - but I digress - save that Holland's account probably goes into more detail about several things than does Gibbon's account:
1. The devastations of the bubonic plague on the Mediterranean basin and Persia.
2. The continuing military campaigns in the West and in Persia by Justinian and Heraklius. The Persians actually seized Jerusalem, Syria and Egypt and the Constantinople based Roman Empire had to seize it all back.
3. Arab auxiliaries in the East were near as common as "barbarian" legions in the west - and when the plague hit. the Roman regulars were outnumbered and outgunned.
The same was true for the Persian Empire in the 600s. Cities were depopulated, survivors did not fully recover. Estimates of about 1/3 of the world's urban population had died in the wake of 580s sweep of the plague. Very apocalyptic when compared with 1914.
Now, here's a kicker. Holland and others are sceptical that the first wave of Arabic conquests was Moslem per se; and a number of commanders might even have been Christian or as open to it as Constantine. Parenthetically, it should be noted that Aryan and Orthodox dominance shifted back and forth all over the Roman Empire map, from Emperors, to invaders from beyond the frontiers being evangelized by Aryans or vice versa. It was the same with Arabs, but with a difference. Because...
Notice how Abraham's seed was promised a domain that stretched from Egypt to the Two Rivers? Well, let's see, who has been in charge of those areas? Not the descendants of Isaac, but the illegitimate side of the family, so to speak. The 7th century Arabs happened to notice their case for probate via Hagar and they ran with it all the way to Tours beyond the Pyranees (732 AD) and farther into Asia than Alexander ever got.
And as for 95% of the Promised Land they have stayed there for about as many centuries as it was promised before the NT.
Prophecy and exegesis are fascinating, aren't they.
As to the JW movement conquering the RE, the contention of the JW movement was that the RE coopted Christianity - and they are somehow mysteriously getting belief back on its track - by distributing endless commentaries by anonymous authors from a mysterious printing press in Brooklyn:
I have trouble imagining how this was supposed to work in the first century or a couple centuries thereafter since Christianity did not have a canon for centuries. And it established its foundations for one only after this presumed co-opting by the Roman state. We essentially subscribe to the collection of book and letters that Athanasius, the archbishop or patriarch of Alexandria recommended decades after Constantine later in the 4th century - 367 AD. Aside from the Torah and TaNakh, the WTBTS society would have to wait for Paul to write his epistles and wait decades later for the Gospel writers to print something as well. Futher complicated by the absence of a faithful and discreet slave, since the phrase and parable from which the notion was derived had not yet been penned - nor had Rutherford yet appeared on earth to conduct a purge of his counsel Moyle after he had already slammed the door on his way out.
But then again, having the WT is somewhat akin to having communities of rabbis in Mesopotamia writing commentary on the Torah and TaNaKh and writing themselves into the ancient text. Was it by accident or design?
Admittedly, many things Holland suggests, I am sceptical of myself. But things he simply mentions in passing are eye openers.