The oldest surviving people of the place are the native people, now of the Muslim and Christian faith. Just because the native people converted to other religions over the centuries doesn't change the fact that they are the indigenous people.
People from Europe or other continents, regardless of religion are not "the oldest surviving people" of the place. That's just silly. Those who follow the Hindu Gaudiya Vaishnava tradition in the U.S. and Europe do not miraculously become indigenous to West Bengal.
That's an interesting analogy, one that rather flagrantly refutes your own babbling.
Egyptian, Syrian and Lebanese absentee land owners are certainty not indigenous people.
Similarly, with the many different invasions that have occurred over the timeline of many centuries across your hilariously described "country of Pal'istan" by various foreign invaders, your selective and biased assignment of "indigenous population" is only unique to you.