by DAVID MASCI, Pew Research, 5/15/15
Unlike some other groups of Christians in the U.S., evangelical Protestants have not declined much as a share of the U.S. population in recent years, according to a major new Pew Research Center study.
Our 2014 Religious Landscape Study finds that since 2007, when a similar survey was conducted, the share of evangelical Protestants has fallen only modestly, from 26.3% of the adult population to 25.4%. By contrast, both Roman Catholics and mainline Protestants have declined by more than three percentage points during the same period.
Looking at the raw numbers, the evangelical population actually appears to have grown slightly over the last seven years, rising from roughly 60 million to about 62 million. Again, this contrasts with mainline Protestants and Catholics, who together have lost several million adherents during the same time period.