Wealth from worship

The idea that religion can bring material advantages has a distinguished history. A century ago Max Weber argued that the Protestant work ethic lay behind Europe’s prosperity. More recently Robert Barro, a professor at Harvard, has been examining the links between religion and economic growth (his work was reviewed here in November 2003). At the microeconomic level, several studies have concluded that religious participation is associated with lower rates of crime, drug use and so forth. —Wealth from worship (Economist)

The article carefully notes the difference between association and causation. Be sure you read all the way to the end for clever bit.