I would say that it really became a thing in its current form in the 1800s. Lots of the weird Biblical “literalism” (and I think things like Salafism/Wahhabism) come from the combination of widespread literacy and direct access to the texts + those ideologies that deny that you need anything outside the text to interpret them yourself/solo scriptura.

What we’re seeing now is related to shitposting being taken seriously for sure (the “birds aren’t real” thing has also been making a slow shift from stupid joke to conspiracy therapy, I think that’s how “Helen Keller” don’t real started)

I trace it back a bit further than 4chan though. You start to see it all the way back in the 90s on Usenet, pretty sure that’s around when the Flat Earth Society Forums - which were clearly mostly Poes - started too.