One in five Americans reports no religious affiliation, study says

http://www.washingtonpost.com/local/one-in-five-americans-reports-no-religious-affiliation-study-says/2012/10/08/a7599664-11c8-11e2-855a-c9ee6c045478_story.html

data source

http://www.pewforum.org/Unaffiliated/nones-on-the-rise.aspx