Negative numbers: The decline narrative reaches evangelicals

"For most of the latter half of the 20th century, religious life in the United States was marked by four consistent trends: oldline Protestant membership was declining; evangelical Protestants were growing; Roman Catholics were hovering just above the replacement level (with new immigrant growth slightly exceeding the amount of erosion in the white ethnic base); and each succeeding generation of adults was participating less in religious institutions..."

http://www.christiancentury.org/article/2013-11/negative-numbers