Given that I don't read from an OT I can't comment on what inaccuracies and fables that exist in it. I guessing you have found inaccurances and fables in the Christian English OT, right?
There have always been Jews who celebrate stuff they don't beleive in. Funny enough, there is language/statements in even the most Reform Passover seder where they are saying that it did happen. One would think if they truly didn't beleive it happened they would erase clear statements in their texts that say it did. For example, the following shows up even in secular Jewish Passover seder books.
בִבְהִילוּ יָּצָּאנוּ מִמִּצְרַיִם
(Translation) In a hurry we left Egypt....
Funny, isn't it?
I know people who pay their taxes and don't beleive in the government they are paying them to.