Your first part is actually quite accurate.
The Aryans did give India proto Sanskrit, but Sanskrit developed natively in India for thousands of years.
I do disagree with the forced part, as the Aryans forced it on the Dravidian speaking people and pushed Dravidian language to south India. So if you really want to be pure of the land, then stop speaking Hindu and start speaking Tamil
We don't have any weird believes of any pure people. In fact it is the Vedas that call them "noble" not us.
I am merely pointing out the similarities of the Aryan invasions and the Islamic ones.
While many Indians despise Muslims because they consider it foreign, they would die to defend their "native" language and culture......which just happens to be not so native to begin with.
And it is due to this paradox that many Indians cannot believe in it. It will destroy their very identity.