Religion and Inequality Go Hand-in-Hand
Among developed nations, America stands out as an exceptionally religious country. While other wealthy nations grow ever more secular, the U.S. remains devoted to religion. New research on religion, however, finds that the U.S. may not be so exceptional after all. There is growing evidence linking religiosity to income inequality—countries where there are more haves than have-nots tend to be more religious than more egalitarian societies. The U.S., for all its wealth, is also a land of vast economic inequality. America's wealth exceeds that of European countries, but this wealth is spread out as unequally as it is in Uganda or Jamaica. And it is this high level of inequality that may help explain the so-called exceptional level of religiosity.
At least since Voltaire, scholars have predicted that religion would eventually be extinguished. It was seen as being ill-fitted for an enlightened, modern, rational world. Early sociologists saw society moving through an inevitable process of secularization. Eventually, went the theories, society would rid itself of the remnant of primitive superstition. Such theorists are still waiting for their Godot. Despite incredible rises in education, science, medicine, and overall quality of life during the 20th century, religion remains a common part of life around the globe.
In light of this continued vitality, a new take on secularization has emerged. Pippa Norris (Harvard) and Ronald Inglehart (Michigan) wrote in their book Sacred and Secular that people are more likely to be religious when their lives are at risk. Nations with harsher poverty are more likely to be religious; wealthier nations tend to be more secular.
Of course, material insecurity is not the only reason for religion. There are some societies that clearly buck this pattern. On one side are impoverished countries that have low levels of religiosity. China and Vietnam are the primary examples. Through force, these countries have been able to clamp down on religion (though not completely extinguish it). In the other direction, the major exception to the rule is the United States. Based on wealth, education, and other measures of development, the U.S. should be far less religious than it is. Indeed, America should be one of the least religious nations on earth.
But it isn't. Far from it. Religion continues as a prominent part of American life.
The reason may be due to inequality. The U.S. economy is distributed much more unequally than other Western economies. By the most common measures of inequality, the U.S. is ranked as the 39th most unequal economy (out of 136 countries). The U.S. is ranked near Uganda, Jamaica, Cameroon, and Cote d'Ivoire. Turkmenistan, Mali, and Cambodia have greater income inequality than the United States. Canada is ranked 101st; the entire European Union is ranked 111th. Sweden is considered the most equal nation.
Within the U.S., we can see the same pattern. States with high inequality, (e.g., states in the Mississippi Delta region) are also some of the most religious. States with more economic equality (e.g., states in New England and the Mountain West) are some of the least religious.
My own research with colleagues Fred Solt and Phil Habel (also from Southern Illinois University) shows that the U.S. is typical of countries with such high inequality. The U.S. is not unusually religious—it is typical for a country with such high inequality. We examine a dozen measures of religiosity, including prayer, church attendance, belief in God, and the self-identification of "religious people." In each case, inequality leads to greater religiosity.
Star Trek Into Darkness

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Roger D. McKinney
SeekTruthFromFacts, There are a zillion excuses out there for why per capita income in Europe is slighter lower than that in the US. But if you understand growth economics, the causes are much more limited. The communist countries incorporated into Europe have vastly lower per capita income rates because they tried to force strict equality of income on their people. The rest of Western Europe has lower per capita income because they have tried harder than the US, but not as hard as the communists, to equalize income. The US is only slightly less socialist than Western Europe, and so the differences in per capita income are that great. I'm not saying that the US is vastly superior in any way to Western Europe. I'm only commenting on the role that the obsession with income equality plays in making everyone poorer.
Roger D. McKinney
The book author assumes that religious people are motivated only by materialist concerns and their religion is nothing but a cover. Deirdre McCloskey does a good job of destroying that bias in academic history and economics in her outstanding books "The Bourgeois Values" and "Bourgeois Dignity".
Jeremy Clark
Proving causality (rather than correlation) is extremely hard in the social sciences, where researchers do not have access to the experimental method of randomly assigning people across treatments. In the case of this research, for example, there is the confounding issue that people who lack faith in a personal God may want to take fewer risks, and want to live in a society with greater income redistribution. So income inequality may not be 'causing' religiousity. It may just be reflecting it.