> Churches and temples, far rarer than in most cities, are wedged into tiny hard to see and find nooks.

The largest churches in the world by attendance are in South Korea:

In 2007, five of the ten largest Protestant churches were in South Korea. The largest megachurch in the world by attendance is South Korea's Yoido Full Gospel Church, an Assemblies of God (Pentecostal) church, with more than 830,000 members as of 2007. https://en.wikipedia.org/wiki/Megachurch

I wonder if this means there aren't a lot of church buildings because they tend to gather in large numbers in a few very large venues instead of gathering in smaller groups in more numerous smaller buildings?