Earlier quoted context omitted.
>The catholic church has stood largely unchanged for the 1600 odd years That's a bit of a myth, thrown around a lot but not quite true. It has existed in some form, but by no means remained changeless. The doctrine is substantially similar but then we can say the same thing about Judaism. Here, we're really talking about the organization, which has many issues: -The East-West schism in 1054 tore the Catholic Church i…
I did stipulate until Vatican II , and my point is rather how little the preceding millenium of reformations and Avignon popes and so on actually changed the church. It undeniably had some impact, like the reformation created a need for educating priests to be able to actually argue their case. But the shape of the organization was largely the same through all of this.
Clearly, that was your point. It's just completely wrong given things like the Gregorian Reform.
You'd have a better argument that the Catholic Church has been largely unchanged in the nearly 1000 years since the Gregorian reform (or, even better, the 700+ years after the series of reforms starting there and running through the 13th century councils) than the 1600 years between Constantine and Vatican II. It’d still be making the qualifier “largely” do an unreasonable amount of work, though.