At least on YouTube, the main channels seem to put up exclusively pseudoscience. I didn't know how religious the movement was until I saw "Behind the Curve" from HBO.
I mean, there's contrarians, who believe all sorts of weird things just because they like the satisfaction of being proven right (which means they tend to only believe things that it seems like some fringe has evidence for somewhere.)
But other than them, if you're taking a heterodox position on something, it tends to be because it confirms or fits in better with the rest of your existing world-view in some way.
And in what world-view, does hypothesizing the Earth to be flat make things you already believe make more sense? A Creationist one.
The best I've found:
He sits enthroned above the circle of the earth, and its people are like grasshoppers
Or:
He spreads out the northern skies over empty space; he suspends the earth over nothing
--
Funnily enough, Big Bang started as a Christian theory
I don't think that's completely accurate, but it would be fair to say that resistance to the Big Bang theory was exacerbated by anti-religious sentiment.
https://en.wikipedia.org/wiki/Fred_Hoyle#Rejection_of_the_Bi...