Worse, they said they had evidence, and they might be right. Which was giving him one hell of a headache just thinking about it. He wasn’t faithful, he still felt shaken. Just how bad would it be for those who were faithful?
Honestly, the simples solution is to take the changed canon from deadlock that edits the timeline a bit:
4k before holocaust. 13th tribe left Kobol.
2k before holocaust. 12 tribes leave kobol for the Cyrannus system (in their 10km long arc ship we can actually find - and nuke - in deadlock).
Simply say that the scrolls were wrong and that the
Thirteen tribes arrived at Kobol 4k years ago.
It's still a big head scratcher, but it skips the whole cycle, the final five and the parallel evolution, and it's not like we don't have cases of books being translated badly, even holy books like the bible.
This would also make out Atlantis as the big point of divergence that the THiE could point to and the Colonials recognize.
Also, a separate question as Deadlock gets brought up a lot:
Are you going to stick to just the show canon or include stuff from it? Just a simple yes or no is enough on that.
(Cylon War FTL drives needed some time to reset so they don't need Tylium to function, with some of the nastier end-game fleets of the game, this means paying hundreds of Tylium units on a regular basis).
This is so blatantly a game mechanic I really don't know why you're bringing this up.