This article on how religiosity and government services and inequality are intertwined.
In short, higher inequality is correlated with a higher level/more responsive government services and average quality of life, as measured by the GINI index. Government services are in turn correlated with lowers levels of religiosity. Thus, in countries with higher average qualities of life, there’s a lower level of religiosity.
To me, the most interesting thing isn’t the study — though it is interesting, but the reflections of American society.
Even more interesting is the current feedback loop between conservatism, which pushes lower levels government services, and the leading supporters of conservatism in America — the evangelical Christian demographic. Conservatism effectively supports religiosity by denying public services to the poor in the name of “helping” them, which shores up religiosity.