We are constantly being surprised that people did things well before we were born. We are constantly remarking on the fact that things are done well by people other than ourselves. "The Japanese are a remarkable little people," we say, as if we were doing them a favor. "He is an Arab, but you ought to hear him play the zither." Why "but"?
Islam united all heresies persecuted in Byzantine Empire and synthesised them well into a conseffion that later became a symbol of Arab self-affirmation.