Funny how my son's 7th-grade social studies textbook fails to mention any of that about Muhammad. It basically says he's this wonderful guy who, as a young man, came up with a clever solution to the problem of who would have the honor of placing the Kaaba in the reconstructed temple (or whatever the place is/was). Then, he received word from God, and Islam took off from there. Nothing at all about how it spread so rapidly, either. Just that it did.
I guess that other stuff is just so much hate speech (even if it happens to be true).