The Arabs also kept black slaves until well into the 20th century while it was outlawed in the West (thanks to the Anglican/Methodist abolitionists)
I work in a super-max prison where all of the various religions that inmates belong to on any given day (mostly dependent on what kind of food each religious group is entitled to) have the "right" to have a chaplain, pastor, priest, imam, rabbi, shaman, or whatever, in the prison to attend to their "religious" needs.
Most of the clergy are there part-time, but the prison imam is there full-time. This particular imam is from Egypt. He's just the nicest, funniest, friendly guy you'd ever want to meet.
One day, I went over to use the copier, and the imam had finished using it just before I got there. I lifted the top of the copier to use it and there was a sheet of paper on the glass that was a drawing of a black man behind bars with blood dripping from both the bars and the man and a long article underneath the drawing titled "The Continuing Oppression of the Black Man in America".
I took it out and left it face-up on the table in the copier room. Maybe I should have taken it to someone, but would I still have a job now if I did? That imam can do no wrong in the place where I work.
I don't ever want to hear from anyone that these people (Muslims) aren't over here working from within to destroy this nation and transform it into another 9th century hellhole. There is a room in the prison that is designated a "mosque", which, incidentally, is off-limits to women, which is sound-proof. This guy can be telling the inmates who he has converted anything at all and no one would know. And many of these inmates eventually get released from prison.