Gallup surveys in 114 countries in 2009 show that religion continues to play an important role in many people's lives worldwide. The global median proportion of adults who say religion is an important part of their daily lives is 84%, unchanged from what Gallup has found in other years. In 10 countries and areas, at least 98% say religion is important in their daily lives.
Each of the most religious countries is relatively poor, with a per-capita GDP below $5,000. This reflects the strong relationship between a country's socioeconomic status and the religiosity of its residents. In the world's poorest countries -- those with average per-capita incomes of $2,000 or lower -- the median proportion who say religion is important in their daily lives is 95%. In contrast, the median for the richest countries -- those with average per-capita incomes higher than $25,000 -- is 47%.
The United States is one of the rich countries that bucks the trend. About two-thirds of Americans -- 65% -- say religion is important in their daily lives. Among high-income countries, only Italians, Greeks, Singaporeans, and residents of the oil-rich Persian Gulf states are more likely to say religion is important.
Most high-income countries are further down the religiosity spectrum. In 10 countries, no more than 34% of residents say religion is an important part of their daily lives. Six of those are developed countries in Europe and Asia with per-capita incomes greater than $25,000.
In the New York Times, Charles Blow makes the point graphically: