By Dan Merica, CNN
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Washington (CNN) – After years of marked growth, the size of Americans who identify with no religion slowed in 2012, according to a study released Thursday.

Since 2008, the percentage of Americans who identify as religious "nones" has grown from 14.6% to 17.8% in 2012, according to the Gallup survey. That number, which grew nearly one percentage point every year from 2008 to 2011, grew only 0.3% last year – from 17.5% in 2011 to 17.8% in 2012 – making it the smallest increase over the past five years.

This study contrasts with headlines from previous studies on religious “nones,” including a 2012 study by the Pew Forum on Religion and Public Life that found the group was the fastest growing "religious" group in America and that one in five Americans now identify with no religion.

“Although this ‘rise of the nones’ has increased dramatically over recent decades, the rate of increase slowed last year, suggesting the possibility that there may be a leveling off in this measure in the years ahead,” reports the Gallup study, which is made up of more than 350,000 interviews.

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