Koran is only for the Arabs, not for other nations or races. It is an Arabic book. In Koran, there are:
27. We have cited in this Koran for mankind every ideal; that they may take heed (Throngs).
28. An Arabic Koran, without any defect, so they may become righteous (Throngs).
All men of the world do not say in Arabic. In Koran, there are rise and fall of some races (ESP. A’ad, Samud etc.), not of any others. When the Koran was being revealed, was there no nation or race in the world without A’ad-Samud? Was there no India or any Indian races then?