Chess News has an interesting feature by Camile Coudari (originally published in 2012, but new to me) on former Grandmaster and WCG co-worker Bobby Fischer. An excerpt.
I do not think it is a coincidence that Fischer did not feel drawn to conventional religious denominations, and that he was instead attracted from a very early age to the World Wide [sic] Church of God, an Evangelical [sic] sect that was quite well known after the war thanks to its radio broadcasts and its ubiquitous magazine, "The Plain Truth".
Even fundamentalist Evangelical churches viewed the [Worldwide] Church as a fringe cult during its half century of existence, which is not surprising if one looks at just one of its basic tenets: Anglo-Israelism, or the notion that the real descendants of the Biblical Hebrews are the people who came to inhabit the English Isles and neighboring countries.
The holders of Biblical inerrancy, who believe that the Bible is the Word of God and that everything in it is literally true (although doors are often left conveniently open for interpretation) have always had a hard time reconciling Christianity's negative and often heinous attitude toward the Jews with the fact that God chose to reveal his Book to them.
Anglo-Israelism cuts this Gordian knot bluntly by claiming that only a small number of modern Jews are descendants of Biblical Hebrews, and that even those belong only to the “bad” tribes (Judah and Benjamin). All other Jews of modern times are claimed to be impostors and to have no direct link with the Jews of Biblical times. The only supposedly genuine Hebrews left are the scions of the Lost Tribes of Israel, who (Armstrong revealed to a supposedly benighted America) migrated ages ago to the British Isles and northwestern Europe.
Armstrong was not the first who devised this solution to the "I love the Bible but not the Jews" conundrum. The Lost Tribes of Israel have been an object of speculation for centuries, and have been located in the most surprising places, from Southeast Asia to Hawaii to British Columbia.
Besides "solving" the Jewish problem, Anglo-Israelism opens the door to an alluring proposition: it marks out all Americans of English and northwest European origin as "real Jews". From a religious point of view, it creates a direct relationship between them and Israel and gives them a claim on the Biblical Land. There is more than meets the eye in the current support for the state of Israel shown by many fundamentalist Christians, something that may seem surprising at first when one considers that many of them come from parts of the United States where not long ago the fiercely anti-Semitic KKK flourished.
This theory is a perfect example of circular thinking. It holds no water as a key to understanding history or the world, but it does give at least a partial understanding of how Fischer, a Jew himself, could justify his anti-Semitism in his own eyes: the world Jewry he loathed and denounced was not a body of authentic Jews, but was a bunch of traitors or impostors. He told me so himself; and went on about it at such length that before I knew it, night had turned into morning.
Art Mokarow gets a special mention.
It was rumored in the chess world in the early '80s that after the fallout between Herbert Armstrong and his son Garner Ted Armstrong, Fischer had followed the latter in the splinter sect he went on to establish. My meetings with the Mokarows and Fischer did not give me enough evidence to say for sure which side Fischer actually chose. I asked Mokarow point-blank once, but he demurred.
Mokarow himself, who can now be found giving his latest take on the Bible on YouTube of all places, claims he stopped working for the Worldwide Church of God in the late '70s and went on to become a very successful businessman. I do not know if he ever made a clean break with that organization, and the whole picture remains blurred as there were rumors at some point in the '80s of a reconciliation between Fischer and Armstrong Sr. (Fischer had donated a lot of money to Armstrong and was very upset when his doomsday prophecies failed to materialize in 1972).
Still, I was left with the strong feeling that, far from being merely Fischer’s representatives, Arthur and Claudia Mokarow exerted a great influence on his decisions. I would go so far as to say that the 180-degree change in Fischer's position on the documentary or towards the invitation as a guest of honor at Gilles' shooting location was the work of people who were loath to let Fischer out of their grip for any length of time. Brady describes the couple as a "kind of buffer for Bobby" and says that they were in a position of "considering offers (and rejecting them) without even discussing them with Bobby".
For what it's worth, I've never heard of any move by Fischer to move across into Ted's CGI, rumours in the chess world not withstanding, though it's possible - perhaps probable - that he was on the mailing list in the earliest days of the split. As for any Rasputin-like influence by Art "God's Puzzle Solved" Mokarow, I'm sure there'll be some folk here who can offer more informed comment than I can.