Christianity continues to decline among U.S. adults as the number of adults identifying as “nothing in particular” increases, Pew Research Center found. The number of American adults who describe themselves as Christian dropped 12 percentage points over the past decade and the number of both Protestants and Catholics in the U.S. has dropped, according to Pew Research data released Thursday. Meanwhile, 26% of American adults identify as atheist, agnostic or “nothing in particular,” a number that increased from 17% in 2009.