A recent study from the Pew Forum on Religion and Life reveals that for the first time in our history, fewer than half of American adults say they are Protestant (48 percent). This marks the first time in Pew Research Center surveys that the Protestant share of the population has dipped significantly below 50 percent. There are now more than 13 million self-described atheists and agnostics (nearly 6 percent of the U.S. public), as well as nearly 33 million people who say they have no particular religious affiliation.