He suggests two kinds of “evangelicalism,” one broadly defined as coming out of the Great Awakening of the 1740s, the other vaguely emerging from fundamentalism in the 1940s. He writes,
“ONE difference is that the first type of evangelicalism includes fundamentalists while the second does not. EXCEPT that in recent years some fundamentalists have infiltrated it and some conservative evangelicals in the movement have begun to act like fundamentalists.”
UPDATE: We might quibble with Olson when he says earlier, “The other evangelicalism is a little less ambiguous. And, until recently, it did not include fundamentalism. In fact, when it began in the 1940s fundamentalists labeled it “neo-evangelicalism” to distinguish it from them.” Olson might be right with the term “neo-evangelicalism,” but George Marsden seems to place the creation of the new moniker with the new evangelicals themselves. Marsden says that the earliest use of the term “new-evangelicalism” as an identifiable movement is by Harold Ockenga in 1953 (in the Pasadena Star News)–though there is a possibility Ockenga used the term as early as 1948. Carl F. H. Henry used the phrase “new evangelicalism” in a generic sense in 1948 (See Reforming Fundamentalism: Fuller Seminary and the New Evangelicalism [Grand Rapids: Eerdmans, 1987], 3, 76, and 146, n. 14).