This is interesting. Both are arch-conservative theologians in the "Judeo-Christian" tradition. Martin is an uber-orthodox Christian. And Masters can sound like one but believes in all sorts of things which evangelicals consider cultic and heretical. In other words, Masters' Foundation For Human Understanding is in the same box as the Mormons and Jehovah's Witnesses.
Masters rejects the Trinity and intimates that Trinitarians aren't saved.
Note: I don't follow either of their creeds. Just makes for interesting discussion between historic orthodox Christianity and one of the new fangled forms of exotic religions that has grown out of the Judeo-Christian tradition and gets termed a "cult" for its rejection of orthodoxy. Welcome to American Protestantism.
Normally I wouldn't post something like this to American Creation, but my other blogs. However, I think this tangentially relates to the issue of Christianity & the American Founding because it relates to such issues as how movements within Founding American Protestantism rejected orthodoxy (indeed Masters, like some of America's Founders is a biblical "unitarian"). And what is true Christianity what is not?