Dywyddyr, I'd give up if I were you: there is simply no getting between a fool and his foolishness.
They don't understand what a fact is, nor what logic is, nor what a belief is, yet they spout utter drivel everywhere they can.
They live off "well, you can't disprove it therefore it's true!", or other such fallacious logic. And they refuse to actually support anything that they claim is more than just a belief on their part.
It's a sad state of affairs when such people, who clearly have no idea how to think critically for themselves, become the most vociferous and pervasive on a forum. And while I accept that some leniency as to the requirement for proof / evidence should be given on matters of belief, that leniency should only be applied when those making the statements do so acknowledging that what they are detailing is mere belief.
If any moderator is reading - I'd suggest swift moderation and close this nonsense of a thread before it becomes just a troll-fest.