Now if only the rest of the world followed suit Americans are slowly becoming less and less religious By David K. Li December 24, 2015 | 11:44pm Americans are slowly losing their religion, according to an annual poll released Thursday. The number of adults who do not affiliate with any faith has increased over time, to 19.6 percent — up from 14.6 percent in 2008, Gallup pollsters found. The United States remains a majority-Christian nation, with 75.2 percent of American adults identifying themselves as Protestant, Catholic, Mormon or of nondenominational Christian faith, according to the poll. Back in 2008, 80.1 percent of Americans said they considered themselves Christian. That figure has been slowly declining since then — to 80 percent in 2009, 79.1 percent in 2010, 77.9 percent in 2011, 77.3 percent in 2012, 76.8 percent in 2013 and 75.7 percent last year. Not surprisingly, older Americans are the ones most likely to call themselves Christians. Every age group from 50-to-54 and up registered at least 81 percent as self-identified Christian. But it goes down from there, with the 45-to-49 set at 79 percent Christian, 40-44 at 74 percent, 35-39 at 71 percent, 30-34 at 67 percent, 25-29 at 62 percent and 18-24 at 62 percent.