The United States has experienced one of the largest declines in religiosity globally over the past decade, new research shows. There has been a 17-percent drop in in the number of U.S. adults who say religion is an important part of their daily life between 2015, when it was 66 percent, and 2025, when it is 49 percent, according to recent Gallup polls. This is the largest Gallup has recorded in any country over any 10-year period since 2007.