D. James Kennedy just featured David Kupelian and his book The Marketing of Evil on his Coral Ridge show.
Kupelian sounds like a fundamentalist Christian, but he may be part of Roy Masters's sect, whose teachings qualify it as a "cult" and "heresy" in the eyes evangelical Christians. I've written about Masters here, where I noted:
His teachings are a mixture of Judeo-Christian fundamentalism, Eastern-New Age philosophy, Freudian psychology with the fundamentalist element coming out dominant. He sounds, at times, like a Protestant fundamentalist. But they regard him as a heretic and a cult leader. For instance, he denies the Trinity and teaches reliance on a New-Agey meditation exercise which Masters dubs "Judeo-Christian" meditation as essential for salvation.
Masters and his group are also long time associates of Joe Farah's WorldNutDaily. Farah is a fundamentalist Christian, but has long featured a number of prominent right-wing figures associated with Roy Masters's group including Jesse Lee Peterson, Michael Savage, Bob Just, and David Kupelian -- who appears to be the most important link between the two groups. See this post detailing the link between Masters, Kupelian, and WorldNetDaily.
Incidentally, Matt Drudge is also rumored to be a follower of Masters, and supposedly, so was the late John Wayne.
Masters's group in Oregon is relatively small time, and most people have never heard of him. But he has managed to gain some significant influence in certain right-wing circles.
Masters may have become even more influential, but, a number of years ago, the Christian right helped to quash the success of Masters's up and coming conservative journal, New Dimensions. Basically, they said, we don't need another Rev. Moon. See this article for the story, which quotes John Lofton: "But as John Lofton of the Conservative Digest stated, 'Masters is a false prophet and theological fraud' and was critical of Christians who embraced the magazine (Ibid)." Keep in mind Lofton wrote for Rev. Moon's Washington Times. As the above link notes, "In the early 1990s, Kupelian was managing editor of a Masters-published magazine called New Dimensions" which is the magazine to which Lofton refers.