This week, Morning Edition explores the "nones" — Americans who say they don't identify with any religion. Demographers have given them this name because when asked to identify their religion, that's their answer: "none."

In October, the Pew Research Center released a study, 'Nones' on the Rise, that takes a closer look at the 46 million people who answered none to the religion question in 2012. According to Pew, one-fifth of American adults have no religious affiliation, a trend that has for years been on the rise. (A more recent Gallup poll shows the uptick in religious nones slowed a bit from 2011 to 2012.)

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