There’s an interesting Gallup poll that compares religious fervor between nations. Here’s a quick summary:
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Religiosity is correlated with poverty — the poorer you are, the more godly you are. I guess God really does like that poverty thing.
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The US is not the most religious nation, not by a long shot — we are well below the median. It is, however, an outlier, as the most religious wealthy nation.
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There is wide regional variation within the US. Mississippi, Alabama, and South Carolina are like poor Middle Eastern or African countries; Vermont, New Hampshire, and Maine are like middle-of-the-road European nations, in terms of their religiosity.

I suspect there has to be a dangerous cycle imbedded in these relationships. Poverty leads to more religiosity as people reach for desperate hope; and religion does nothing to solve real problems, leading to worsening poverty.