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. In the last five years alone, the unaffiliated have increased from just over 15% to just under 20% of all U.S. adults. Their ranks now include more than 13 million self-described atheists and agnostics (nearly 6% of the U.S. public), as well as nearly 33 million people who say they have no particular religious affiliation (14%)
