By the way, do you know one historical fact that while Hazrat Shahjalal never married in Bengal, but ALL his disciples took local women as their wives. These disciples were and their descendents still remain 'Shaikh.' So, in the very beginning the descendents were no more pure blooded Arabs. On top it, Arabs are not super human being. They are just like others or other muslims of other countries where also the muslims dominated the politics of those regions for many Centuries.
So, if the Arabs were brave and they fought and built empires in many parts, so did all other muslims of other zones that include also Bengal. So, an Arab and a non-arab Muslim were equally brave and equally Muslim. Non-Arab Muslims also proved themselves at certain juncture of history.
People should identify himself not by his creed (it is the expressed wish of Allah). He is supposed to be identified with his native land he was born. Iran's Ayatullah Khomeini was a Syed and his forefathers were Arab. But, he identified himself not an Arab but an Irani. This is what every one should do. Am I wrong?
Another matter, are the descendents of domiciled Arabs in Begal, India or Pakistan are given any VIP treatment in Arabia? Certainly not. Then, why people should try to brag about that which exactly Allah has forbidden?