In broad terms, ARIS 2008 found a consolidation and strengthening of shifts signaled in the 2001 survey. The percentage of Americans claiming no religion, which jumped from 8.2 in 1990 to 14.2 in 2001, has now increased to 15 percent. Given the estimated growth of the American adult population since the last census from 207 million to 228 million, that reflects an additional 4.7 million “Nones.” Northern New England has now taken over from the Pacific Northwest as the least religious section of the country, with Vermont, at 34 percent “Nones,” leading all other states by a full 9 points.

“Many people thought our 2001 finding was an anomaly,” Keysar said. We now know it wasn’t. The ‘Nones’ are the only group to have grown in every state of the Union.”

The percentage of Christians in America, which declined in the 1990s from 86.2 percent to 76.7 percent, has now edged down to 76 percent. Ninety percent of the decline comes from the non-Catholic segment of the Christian population, largely from the mainline denominations, including Methodists, Lutherans, Presbyterians, Episcopalians/Anglicans, and the United Church of Christ. These groups, whose proportion of the American population shrank from 18.7 percent in 1990 to 17.2 percent in 2001, all experienced sharp numerical declines this decade and now constitute just 12.9 percent.

On the 30th of September 2007, Richard Dawkins, Daniel Dennett, Sam Harris and Christopher Hitchens sat down for a first-of-its-kind, unmoderated 2-hour discussion, convened by RDFRS and filmed by Josh Timonen.