So basically it would be better to put down Syncretic/Exclusive?
Depends on what era you intend to cover. The earliest “exclusive” religion you have is monotheistic Judaism which “mainstream” scholarship would date at around ~700 BCE (and I will emphasize once again that this is a highly debated question). From there for all intents and purposes it is only joined by Christianity post its break with Judaism (~100 CE) and later Islam (~622 CE). Basically for the next 1000 years, those stand alone in the “exclusive” category, and even then, as I mentioned earlier, there were syncretistic tendencies on the popular level in all of them.
Also, did you ever extend your Religion essay?
The last update is recorded in my signature.
It still varied. I suppose you could say there was institutional religion even in Ancient Greece, but it is certainly incomparable with institutional religion in Egypt. Popular religion is, of course, omnipresent.
It is not a question of institutional/official religion or not, but rather what form(s) did the institutionalization of religion take. When a state funds, out of public money, the construction of a temple or sacrifices, such as the Greeks did, in my definition that is institutional/official religion.
Arguably the spread of mysteries and oriental cults in Greece and then to a greater extent in Rome was associated with/led to a major change in religious values (less tied to native and ancestral tradition, usually more accessible to social outsiders and so on). Then again, they coexisted with the old cults and mostly filled a niche; it's just that this niche expanded significantly over time.
The problem with mystery cults is, well, they were mysterious, which means we don’t really know much about them. I would be very hesitant to make general observations based on guesses and suppositions of things even the most specialized scholars do not understand well. Even with the mysteries, the vast majority of them were tied to a locale (Eleusian Mysteries in Eleusis, Cabiri in Samothrace, Zeus Panamaros in Asia Minor, Andania in Messenia) and those that weren’t did have a religious precedent in the Diaspora worship of YHWH.
I don’t completely buy your link with a major change by being less tied to native and ancestral tradition. We know that as far back as the bronze age the cosmopolitan (such as traders) would worship other gods depending on their locale. So, for example, if you were traveling down a road and saw a shrine, you would worship there even if your family/clan had never heard of that particular god/spirit. When the mysteries spread beyond the locale, they often were brought by the natives, such as in the spread of the Dionysian Mysteries into Italy being brought by Greek slaves. When it spread outside of that ethnic group, it is unclear as the motivation behind it. Livy, for example, in speaking of the spread of the Dionysian Mysteries attributes it to the “joy of wine and of food” rather than to any religious motivation.
Eh, anyway, I don’t really know what my point is with all this, but there you go.
I generally agree, but it's an important technical note that cities often functioned as chokepoints. Capturing and securing the major cities of the region will generally grant one control over the countryside as well.
I acknowledge, but the amount of countryside one can gain from the fall of one city is necessarily limited, especially in the more urban areas such as the Netherlands and Italy. On the older maps this is virtually impossible to show, on the newer maps, while difficult, it is possible.