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meridia hospitals But attendance at Mass and Catholic identification in the U.S. has been steady since 2007, when 23 percent of U.S. adults self-identified as Catholic, to 2013, when 22 percent did so. In 2007, 41 percent of U.S. Catholics reported attending Mass weekly or more often and 39 percent did so in 2013. Americans consistently report attending church more often than they actually do, Pew says.