The Crusades — gruesome as they were — were not some early outbreak of “Islamophobia.” They were an effort, by Christian nations in Europe, to defend Christians in the Middle East who were being slaughtered by Muslim tribes, and specifically to take back the city of Jerusalem from the Muslim armies who had invaded it.
It is a very strange interpretation of history to put the blame for slavery on Christians, but to ignore William Wilberforce, Abraham Lincoln and other Christians who led the world in fighting to abolish it. Slavery is still practiced by Muslims in Mauritania and, as recently seen, by Boko Haram.
Barack Obama is the President of the United States, but to judge from his speech at the National Prayer Breakfast last Thursday morning, one might get the impression that he thinks himself far more than that.
He and his speech-writers presumably realised with the news in America, as in the rest of the world, dominated day in and day out with atrocious news stories from Muslim communities in the Middle East, the President would probably have to make a reference to Islamic violence.