The Effect of Passover
Most of recorded human history has been about societies of peasants ruled by armed bullies. You can think of the story of Exodus as a protest and partial reversal of the beginning of that.
Question: If the story of Exodus weren't part of Western Civilization, what would it look like by now?
The Exodus wasn't the only resistance movement. You can think of Greek democracy or English common-law as other instances of resistance. In the case of Greek democracy, the resistance declined after a while; it wasn't reinforced by a religious story. I suspect there would have been a similar decline in our civilization if it weren't for the story of Exodus. Did the Exodus stand between our society and a society of kings ruling subjects ruling slaves?