Born and indoctrinated as a Jew, I accepted the Exodus story as historical fact.
If there was one biblical impetus for my disbelief, however, it was the Passover story.
Omniscient God? Why then assign an angel that needs to see smeared blood from a slain lamb to kill infants?
Benevolent and omnipotent God? How could his best idea be to murder innocent children.
And with the Pharoah already ready to capitulate, why "harden his heart" just for a chance to impose more suffering?
It's a repellant and illogical story that helped drive me away first from religion, and then from any concept of the Judeo-Christian God.