For those who say that the Easter story is "nasty": yes, that's true. My brother (then aged six) cried on hearing the story of Abraham and Isaac: not because Abraham was about to kill his son, as ordered by God, but "what about the poor ram", who was killed in Isaac's place? With the ubiquitous story of Joseph, how does one explain to children why Joseph was in prison, because he was shagging Mrs Potiphar?
But then, many fairy tales are quite nasty, especially the original versions, and Henrich Hoffmans's grisly book Struwelpeter was sold as entertainment for children. Were children made of harder stuff in the nineteenth century? Harry Potter is not exactly cosy reading, either. "You got that scar in the car crash when your parents died. And don't ask questions."
Incidentally, there was a Catholic head teacher who banned all things to do with Harry Potter from her school, because "the occult is very real, and very evil, and children should not be reading about it". The owner of a certain well-known toy shop chain had a "calling from God" to become a Christian, and none of his shops are open on Sundays, and they do not sell anything to do with Hallowe'en or Harry Potter.
While traditional Christianity might seem out of place to some people in the modern world, as others have said, it has certainly shaped our history, and as such, should be known and taught about. (And I say this as a child who didn't see the point of learning history and religion, because it was all in the past.) Nowadays, when this is taught in school, it is very much with the caveat "some people believe". When I was at school, it was still taught as fact: I remember my teacher saying "in those days, God spoke to people".