I've not gotten too far into this massive Pew Study on American religion, but the fluidity of religious preferences is rather surprising:
More than one-quarter of American adults (28%) have left the faith in which they were raised in favor of another religion - or no religion at all. If change in affiliation from one type of Protestantism to another is included, 44% of adults have either switched religious affiliation, moved from being unaffiliated with any religion to being affiliated with a particular faith, or dropped any connection to a specific religious tradition altogether.
