Catholics' Church Attendance Resumes Downward Slide. (Gallup, 4/9/2018)
As Gallup first reported in 2009, the steepest decline in church attendance among U.S. Catholics occurred between the 1950s and 1970s, when the percentage saying they had attended church in the past seven days fell by more than 20 percentage points. It then fell an average of four points per decade through the mid-1990s before stabilizing in the mid-2000s. Since then, the downward trend has resumed, with the percentage attending in the past week falling another six points in the past decade.
This analysis is based on multiple Gallup surveys conducted near the middle of each decade from the 1950s through the present. The data for each period provide sufficient sample sizes to examine church attendance among Protestants and Catholics, the two largest religious groups in the country, as well as the patterns by age within those groups. The sample sizes are not sufficient to allow for analysis of specific Protestant denominations or non-Christian religions.