but that is certainly not predominant, so to say that they "originated" in India is quite inaccurate. Sure their earliest ancestors must have passed through India during the Ice Ages, but that would be like saying everyone originated in Africa.
"Aryan" originally refers to Indo-European languages, of which Hindi and related tongues are classified as, and Indian facial features resemble white people more than ours do. As for whether Khan is a real Bengali, he was born there and speaks the language.
We also have a deep-rooted inferiority complex.