The myth generator screens actually seemed to leave room for that sort of thing, over on the right side it had adjectives like "lost" "doubted" "destroyed" and whatnot as I recall, I've got some of the shots I took from the video somewhere.
Is that the video of Tarn showing the prototype off? I had to stop watching because I was busy. Yeah, I'm pretty sure he mentioned somewhere that myths could become lost so that's a definite one, but I'm mainly concerned about the fact that he showed off a block of creation myth - feels like it'd imply there's only one creation myth per world, which is just not cricket.
It'd be great in Adventure mode to be faced with a bunch of different religions, each with codexes that contradict one another, making you unsure as to which is the truth, if any. Also that sense of suspicion if the god you worship even exists - or could just be asleep for a thousand years. It'd be Fun if you got fed up and renounced your god, only to be struck down for your impudence and disbelief.
Maybe, if there was a Prime Myth that every other religion took bits of and added their own nonsense, you'd have the option to try and collate all the historical and religious information you can to decipher common Myths and Events. New Adventurer Job: Historian. It'd certainly give you a reason to visit libraries and collect books. Maybe you keep finding this mention of a Dark Tower in different cultures, so you venture out to it and see what information could be stored there.
EDIT: Watching the video now. It does seem to imply different cultures will interpret the creation myth differently (depending on what they were associated with), but they do seem to share gods. My question was about whether they'd believe entirely unique creation myths, but this might work better. I could see this as a Zeus/Jupiter situation, where they just call things differently but have a similar root, so that's very interesting and plays more into the historian idea. One issue I have is that it doesn't seem to generate unique religions - just race-wide ones. It'd be cool to see sects and offshoots from big religions that interpret the creation myth and its gods differently. Like if some necromancers believe one god was actually a death deity and rewrite history to fit their view.
EDIT2: Finished it. Now I feel silly, so I edited my question a bit. Basically I just want to know if we can expect lies to be possible.