Where Protestants and Catholics Go When They Leave Their Churches
About 16 percent of all Protestants who stayed Protestant actually changed subgroups during the four years of the survey. Together with the 9 percent of Protestants who left, that means approximately one in four Protestants in 2010 had a different affiliation by 2014.
Outside of Baptists (22.9% of Protestants), the second-largest denomination is actually no denomination at all (18.2%). More Protestants identify as nondenominational—a relatively recent phenomenon in church history—than Methodists (14.8%) or Lutherans (11.8%). No other Protestant denomination makes up more than 7 percent of the overall Protestant tradition.
Even without tracking movement to or from specific denominations like the Southern Baptist Convention or the United Methodist Church, the CCES data shows the general trends in intra-Protestant switching. A great deal of activity centers around nondenominational churches....