A lot of the "simple Bible stories" are simply not for children.
Did you teach your children about how the Israelites smashed the heads of Amalekite infants on rocks?
How about the story of how good King David committed adultery and then committed murder to cover it up? Did you teach those simple Bible stories to your 4 year olds?
That's not what I meant, either. Everyone reads what they want, I guess. This pastor's kids didn't know about David and Goliath, Noah and the Ark, Jonah and the Great Fish, etc.
They didn't even know how to play Christmas songs at Christmas! This is more common these days than you might think -- everyone is wanting to be a megachurch, even in smalltown America.