I think the burden is on you and your goofy claim, and your goofy authors, do you accept that Abraham Lincoln was black?
Randolph was a man of high standing, and so he belonged. That's how it was. Dissent was not well tolerated, as the Scotch-Irish Presbyterians among others knew quite well, settling in remote Shenandoah Valley if they remained in Virginia at all, specifically in order to be beyond the reach of those who would use the power of the State to smother dissent. I have a Baptist ancestor who was forced to leave Goochland County for this very reason. He came to NC, as did many in a similar situation. Others continued on up the valley into what later became Tennessee, or went further into the hills into what later became Kentucky.
George Washington, too, belonged to the established church. He played a large role in disestablishing that church, though. By the same weird backflip of revisionist logic, what would that make Washington? He continued to attend the church he literally designed and built, Pohick Church. Virginians called it Anglican, not Episcopalian. The question of any presumed "conversion" of Randolph, from what, to what and when, can be answered similarly. The when is particularly important because of the establishment and then disestablishment of the Anglican Church in Virginia.
For those unfamiliar, Anglican = Episcopalian = Church of England.
The original author, who lived in the 19th century and wrote a biography of John Randolph, and David Barton, who cited him in 2007 as a result of Keith Ellison’s (a Muslim) election to Congress and the press’ claim that he was the first Muslim elected to Congress—neither are goofy, and I don’t have a burden to prove/do anything regarding the subject. Good day.