One problem in discussions such as this is that the 'soft' sciences (sociology, psychology, and to an extent, theology) have become so PC, sometimes that noted scholars can be said to be liars. A few years ago I read a book comparing the Xian, Jewish and Islamic concepts of God. The author was an ex-Anglican nun who is considered a world authority on her subject. The book was published by the Yale University Press. In the section on Islam, she lied. Not erred, not espoused a minority theory; she lied. Every dictionary I have ever seen gives the same origin of the word 'Koran'. She gave a different one which showed Mohammed in a kindlier light. There were many other items as well. So choose your references carefully and read the source material if you can.