I’m using “evangelicalism” here in the sense of orthodox Christianity vis-a-vis liberal Protestantism.
While doing some research I read this paragraph from a doctoral dissertaion accurately describing the state of evangelicalism since 1942:
In 1942, the National Association of Evangelicals was formed partly in response to concerns shared by many evangelicals, who wanted to start a national body in contrast to the Federal (now National) Council of Churches. Around the same time leading fundamentalist, Carl McIntire, formed the American Council of Christian Churches for similar reasons. What separated the two agencies was really the issue of ecumenical separation. The NAE did not restrict membership from those individuals who were attached to denominations holding membership in the FCC, while the American Council did (including even denying membership to churches involved in the NAE). The fate of the two organisations over the second half of the twentieth-century has shown that most evangelicals sided with the ideology of the former.
Timothy James Burdick, “Neo-Evangelical Identity within American Religious Society of Friends (Quakers): Oregon Yearly Meeting, 1919 – 1947,” p. 350 [emphases added]
Dan Greenfield 