The beliefs which form the basis of modern Hinduism go back into the mists of time, well before the arrival of Christianity in the subcontinent.
“Most of the Hindu persecution of Christianity in India now is driven more by nationalistic concerns than religeous. “
Probably. Als probable, some Hindui intolerance of non-Hindus has been a reaction to the exposure of Hindus to Islam. Pakistan is a violent, intlerant, aggressive Islamic state. Before Pakistan existed, there was much violence in the subcontinent between Hindus and Muslims - as in every area where Islam sought - or seeks - to intrude itself.
You seem to sugest that Christianity as an ‘interloper’ has somehow no real moral or historical authority to be there. By that standard, no religeon has any right to be anywhere, since you can always find some other beliefs that predated it. The fact is that the establishment of Christianity in India was not based on conquest, as was the case with Islam.