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Church attendance has been edging down in the U.S., and a decline in "outstanding" local church leaders could be a factor.
American Catholics, about 23% of the U.S. adult population, remained positive about Pope Francis in early August, giving him a 78% favorable rating.
Americans' identification as born-again or evangelical has stayed remarkably stable since 1991, even as other indicators show Americans becoming less religious.
American public opinion during World War II and the Holocaust is the subject of a new exhibit at the United States Holocaust Memorial Museum.
Two-thirds of highly religious white Protestants approve of the job Trump is doing as president, and they are likely to continue barring major policy changes.
In 1953, Gallup found 69% of Americans in favor of adding the words "under God" to the Pledge of Allegiance, while 21% were opposed.