There’s so much to choose from: the apocrypha, the points at which Jesus (if it was one man) had his story turned into a movement, and then subverted, cave paintings of people wearing helmets, the role of ancient cults in subverting the early Church and turning it into something else entirely, and let’s not forget this:
Tl;dr there is that earth’s shape causes it to periodically flip:
This is the old source of “the sun rises in the north and sets in the south” as heard in much verbal-tradition, and arguably why around 5000 years ago people went absolutely nuts hauling huge stones to check the sun was rising in the same place at midsummer and midwinter, because wobble might precede the flip, so tracking any change in the location would be worth that time and effort.
If it did roll, the oceans would (it’s argued) keep right on going along their existing motion, causing massive floods and breaches in the earth’s mantle, causing lava to consume some regions (there you have your “hellfire punished the baddies” myth).
Oral history is remarkably resilient and possibly MORE accurate than written, where it survives. So those ancient circle builders may have had a tradition, and attempted to pass it along, only to be basically genocided by the Romans.
I’ll self-link this on the topic of history and what we lose, while I’m here: Things our society has lost or forgotten: could true magick be one?
I know these are not directly on topic, but they are highly suggestive of the fact history is far from set in stone, and that erasing all records of a thing will result in it being lost within 2 - 3 generations.