last updated 9 November 2023
The Great Emergence: How Christianity is changing and why, 2008, Phyllis Tickle

Overview:
(Parts taken from Austin Syllabus; see below)
Emergence Theory: What comes from conflicted, chaotic and transitional states is something both new and unexpected.

The Right Reverend Mark Dyer, an Anglican bishop known for his wit as well as his wisdom, famously observes from time to time that the only way to understand what is currently happening to us as twenty-first-century Christians in North America is first to understand that about every five hundred years the Church feels compelled to hold a giant rummage sale. And, he goes on to say, we are living in and through one of those five-hundred-year sales.

The 3 results of a 500-year Church Rummage Sale

The 6 "Greats" in 3000 Years of History
Note: Tickle changed some of the labels in her 2016 seminar (see below). Those are noted with an *.

* In her 2016 seminar (see below) Tickle changes some of the labels.

The Great Emergence - Syllabus and Study Guide.pdf | Derek Austin
Summarizes major events.
Links:
"Emergence Christianity" Phillis Tickel Seminar | YouTube, 2012 - St. John's York Mills Church, UK (SJYM)


Source: Christian denominational families | Wikipedia

500 year cycle:
In her seminar, Tickle says that 500 year cycles are predicted by General Systems Theory. The gives an example of Judaism following a similar 500 year cycle.
I couldn't find any collaboration of that.
Sorry for the digression but I'm a former statistician interested in these things.
Peter Turchin's book Secular Cycles , is frequently quoted in this area
The introduction to Secular Cycles says "Many historical processes exhibit recurrent patterns of change. Century-long periods of population expansion come before long periods of stagnation and decline."
Nowhere is a 500 year cycle mentioned in it or related documents.
In Turchin's article "Long-Term Population Cycles in Human Societies" he refers to population oscillations with an approximate periodicity of 200-300 years characterize a great variety of agrarian states. This is based on the time it takes for population growth to outstrip food supply.
An asside: "The Mayan civilization lasted 2,400 years"