During the 20th century prior to 1990, the popularity of Christianity had been stable
in the U.S. About 87% of adults identified themselves as Christians. The country then experienced a major change.
Significant numbers of American adults began to disaffiliate
themselves from Christianity and from other organized religions. By 2008, the
percentage of Christians had reached 76% and is believed to be continuing its
decline.
The former-Christians do not seem to have joined new religious movements (NRMs)
or other world religions; they mostly left organized religion entirely and became secularists.
Since World
War II, this same process had been observed in other countries, like the U.K.,
other European countries, Australia, Canada, and New Zealand.