Approximately one-third of those who say they were raised Catholic no longer describe themselves as Catholic; which means that roughly 10% of all Americans are former Catholics. Other surveys — such as the General Social Surveys, conducted by the National Opinion Research Center at the University of Chicago since 1972 — find that the Catholic share of the U.S. adult population has held fairly steady in recent decades at around 25%. Losses have been partly offset by the number of people who have changed their affiliation to Catholicism but more importantly by the disproportionately high number of Catholics among immigrants to the U.S.

Source: Pew Research Center

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