BS. Perry is just talking about teaching the rise and expansion of Islam without any teaching OF islam.
Our history lessons have focused primarily on western culture, and has be woefully inadequate in dealing with some of the other major civilizations.
Still, part of the REAL history of Islam....taken from authentic, fully ISLAMIC sources...is that Mohammed was a pedophile pervert (besides being a bloody murderer, robber, liar, etc.).
Most educated people, who think they know the history of Mohammed and Islam, do not know that. And is certainly is not in the curriculum.