The life cycle of a congregation is often described a bell curve, mapping out membership growth over time. Martin F. Saarinen (The Life Cycle of a Congregation -Alban.org), and others, chart how a congregation is born with enthusiasm, has significant yearly growth for a decade or so, enters into a long period of stability, then falls into decline, leading in time to death. My first response to seeing this curve was to ask, what about Canterbury Cathedral? Obviously there are outliers, that is churches whose lifespan is so unexpected that it skews the chart.