The poll, called “The Global Index of Religiosity and Atheism,” found that the number of Americans who say they are “religious” dropped from 73 percent in 2005 (the last time the poll was conducted) to 60 percent.

At the same time, the number of Americans who say they are atheists rose, from 1 percent to 5 percent.

The research is based on an experiment conducted during the 2010 census in which nearly 500,000 households were given forms with the race and ethnicity questions worded differently. The findings show that many people who filled out the traditional form did not feel they fit within the five government-defined categories of race: white, black, Asian, Pacific Islander and American Indian/Alaska Native; when questions were altered to address this concern, response rates and accuracy improved notably.

For instance, because Hispanic is currently defined as an ethnicity and not a race, some 18 million Latinos — or roughly 37 percent — used the “some other race” category on their census forms to establish a Hispanic racial identity. Under one proposed change to the census forms, a new question would simply ask a person’s race or origin, allowing them to check a single box next to choices including black, white, or Hispanic.

The other changes would drop use of “Negro,” leaving a choice of “black” or African-American, as well as add write-in categories that would allow Middle Easterners and Arabs to specifically identify themselves.
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“As new immigrant groups came to this country decade after decade, how we measure ethnicity changed to reflect the changing composition of the country,” [Census director Robert] Groves said. “Since that change is never ending and America gets more and more diverse, how we understand and tabulate the information has to be continually open to change.”

“It’s critical that race and ethnicity reflect how people identify themselves,” he said.