Don't you think it a bit odd demanding answers of a Christian regarding the Hindu experience while avoiding asking someone who is presumably of that persuasion and certainly has more experience in that direction than I do? I certainly think it's odd.
I'm not asking you about the Hindu experience. I'm asking you why literally no Indian had any clue that Christianity existed before Christians arrived to tell them about it. If it's all the same god, why did they have no idea about original sin? Conversely, why did the Christian pantheon not include a god remotely like Ganesha?
The answer is because religions are not inspired by God but are human inventions. That's why they only propagate via human interaction.
Do you think Indians were proselytised ( I feel you tried to make that sound like bad thing) or did some possibly convert through their own volition?
Proselytisation is a bad thing. It's the process of telling people that they've got the wrong gods and they need to start worshipping different gods, sometimes literally on pain of death.