While Catholics and white mainline Protestants remain two of the largest religious groups in the United States, they have each experienced significant declines in membership.
Although nearly one-third (31%) of Americans report that they were raised Catholic, only 22% currently identify that way, a net loss of nine percentage points. Notably, 12% of Americans today are former Catholics.
While 15% of Americans currently identify as white mainline Protestant, 19% report that they were raised in that tradition. This shift represents a net loss of four percentage points.
