Sentence:  For example, in a 2008 report called "American <WSD>Nones</WSD>: The Profile of the No Religion Population" released by the respected ARIS (American Religious Identification Survey), one reads that “the <WSD>Nones</WSD> increased from 8.1 percent of the U.S. adult population in 1990 to 15 percent in 2008 and from 14 to 34 million adults. ...” 
Meaning of the word marked with <WSD> tags:  Those without any religious affiliation: atheists and others outside any organized religion.