I'm sure Putnam is right that there's been a decline in certain kinds of organizations like bowling leagues. But people participate in communities in other ways.
Some people seem to gravitate from one fundamentalism to another, from some kind of secular fundamentalism into a religious fundamentalism or the other way around, which is not very helpful.
Some people think that as the Chinese economy becomes more and more capitalistic it will inevitably become more democratic.
The basic fault lines today are not between people with different beliefs but between people who hold these beliefs with an element of uncertainty and people who hold these beliefs with a pretense of certitude.