Even though atheists are few in number, not formally organized and relatively hard to publicly identify, they are seen as a threat to the American way of life by a large portion of the American public. “Atheists, who account for about 3 percent of the U.S. population, offer a glaring exception to the rule of increasing social tolerance over the last 30 years,” says Penny Edgell, associate sociology professor and the study’s lead researcher.

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Edgell believes a fear of moral decline and resulting social disorder is behind the findings. “Americans believe they share more than rules and procedures with their fellow citizens—they share an understanding of right and wrong,” she said. “Our findings seem to rest on a view of atheists as self-interested individuals who are not concerned with the common good.”