That's interesting, when the caller said treat slaves as equals "an oxymoron if I ever heard one". I could swear I read something just like that sentiment in the Bible.Is it the worst part of the Sharia?
To your question I think maybe a big issue is how seriously Muslims take their religion compared to most others which reminds me of something @LuisDantas said that resonated a bit, which was something to the effect that Islam goes beyond being a religion and becomes more of an obsession, which I take to mean for extremist types.