Why did the early church grow and succeed? It’s a fascinating question. Chadwick gives some support to those that love cities but also says,
“Nevertheless, the Christian mission was not directed merely at centres of power. It was consciously aimed at the common people, and the ideals of simplicity and humility were never far from the minds of those who had to propagate their faith.” (p72)
Emphasis mine. I’m not sure that those ideals are anyway close to the minds of most church leaders in the western church. Maybe there’s a connection there.