Cue the ACLU.
(psst! ACLU! You're on!)
As is pointed out in the article that Boortz links to, if this history class included a unit on the history of Christianity, what do you think would happen?
"Class, today we're going to start our unit on the history of Christia--"
"You have been served."
The 9th Circuit Court (yeah, them) said that a similar situation was perfectly all right.
So let me understand this: if it's Christian, the Constitution forbids it. But if it's Muslim, it's "cultural education".
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By the way: Liberals are now "progressives". I'm not sure which term is more damning, after reading that article.