The number of Americans who do not identify with any religion continues to grow at a rapid pace. One-fifth of the U.S. public – and a third of adults under 30 – are religiously unaffiliated today, the highest percentages ever in Pew Research Center polling. …
While the ranks of the unaffiliated have grown significantly over the past five years, the Protestant share of the population has shrunk. In 2007, 53% of adults in Pew Research Center surveys described themselves as Protestants. In surveys conducted in the first half of 2012, fewer than half of American adults say they are Protestant (48%).
This marks the first time in Pew Research Center surveys that the Protestant share of the population has dipped significantly below 50%. [cont.]
Pew Research Center’s Forum on Religion & Public Life