except that it came first on the continent, and in a theocracy that would eventually colonize a lot, and at a time where the metagame was really pushing for religion to be taken seriously
Yup, I have to agree on that. SA was just the "right time right location".
my two cents to the religion debate.
In my oppinion most players seek to "improve" their characters. A religion does not offer anything physical to use. It´s mostly RP and lets be honest, a lot of the players seek something to improve their char and a good RP is not part of that. Very bluntly said, a new noble seeks to become a region lord in the shortest way possible (or some other title/position). Religions mostly can't offer this. SA, due to it being large and state religion in many realms has the possibility to offer such physical improvemends.