The upsurge of interest in Martin's work and CRI coincided with the Jesus People revolution, the counterculture, and the social conflicts over new cults in the 1970s. During the 1970s and 1980s a number of younger apologists were mentored by Martin through CRI and included Cal Beisner, Todd Ehrenborg, Craig Hawkins, Carole Hausmann, Kurt Van Gorden, John Weldon, George Mather, Paul Carden, Rich Poll, Robert M. Bowman Jr., Kenneth Samples, and Elliot Miller. The profile of CRI increased with the widespread sales of Martin's book "The Kingdom of the Cults" (now in the vicinity of some 750,000 copies sold), his audio-tape albums, his radio ministry, and his appearances on national television.