In his history of the downfall of the Conservative Baptists, Richard Clearwaters emphasized the importance of the Pre-Tribulation Rapture several times. He showed that one of the principles of both theological modernism and New Evangelicalism is the denial of the imminency of the return of Christ and a replacement of a concentrated focus on the Great Commission of world evangelism with a kingdom building emphasis. Clearwaters observed that one of the elements of the downgrade was “a more tolerant attitude toward varying views of eschatology.” In 1956, he wrote, “Students have gone from Northwestern [founded by W.B. Riley and Pre-Trib from its inception] and other similar schools to these schools [Fuller Seminary and Denver Conservative Baptist Seminary] with a simple faith in the Word of God about the Rapture of the Church and the Second Coming only to later come to me disturbed, not knowing whether they were now looking for the Christ to rapture His Church or for Anti-Christ; whether the ‘blessed hope’ of the church was half or all of the Tribulation; whether Christ was coming with His Church or for His Church” (The Great Conservative Baptist Compromise, chapter 3, “The Bible, the Unchanging Evangelical,” p. 48).
Clearwaters said, “The only contribution made by rethinking eschatology has been a glorified question mark” (p. 49).
Clearwaters emphasized that the dispensational Pre-tribulational doctrine is established by a consistent literal method of interpretation (p. 50).
Clearwaters said the early Christians believed in and were looking for the imminent return of Christ. “Clement of Rome, fellow-laborer with Paul (Phil. 4:3) wrote (AD 95), ‘Let us every hour expect the kingdom of love and righteousness, because we know not the day of His appearing.’ ... They were not looking for one half or all of the Tribulation to prepare them for it” (The Great Conservative Baptist Compromise, p. 197).
The prominent role of post-tribulationism in the downfall of the Conservative Baptists was emphasized in the report “Conservative Baptist Cross Currents in Colorado,” published in May 1962 in the Baptist Missionary-Evangelist. Written by four preachers who had been active in Conservative Baptist work in Colorado since the 1940s, it documented the invasion of new evangelicalism. They emphasized that one of the ways the new evangelicalism showed itself was in the rejection of dispensational Pre-tribulation theology. “By 1954 it was evident that the [Denver Baptist Theological] Seminary had introduced a doctrine foreign to Colorado Conservative Baptists—the accepted dispensational premise was being abandoned in favor of reformation theology. In relation to this position is the theory of the post-tribulation rapture of the church. Dr. Burdick is reported to hold strongly to this ‘post-trib’ position, and President Vernon Grounds has stated, ‘As for myself, I am in a state of indecision. ... I will not say that I am a pretribulationist. ... I simply do not know, though I incline toward the ‘post’ view’” (from ‘Divided We Fall,’ page 5, compiled by Wayne Musson, Lake Crystal, Minnesota). In 1962, it was estimated by a Denver Seminary graduate that ‘half of the graduates now take the post-trib position, about 25% take the pre-trib position, and the other 25% are so confused they do not know what to believe.’”
https://www.wayoflife.org/reports/role-of-pretribulation-theology.php