And we have to get off our high horse, per Obama, about criticism of Islam, because look at what went on with the Crusades and what happened in medieval Europe with inquisitions and all that.
So far as slavery goes, that was then, this is now.
The US no longer practices slavery as a matter of policy, Virtually every sect of Islam practices some form of slavery, and while many of the practices are relatively benign, some are as brutal as ever seen in all of history.
And Islam has ALWAYS practiced some form of human bondage. Part of the booty from pirate or bandit raids was taken in terms of involuntary servitude.
The authority for the taking and keeping of slaves is very specifically designated in the Koran and further explained in the various Hadith writings.