Talk politics.

How would you prove the theory otherwise? The implication is that Jesus undertook a decade long mission to India where he studied with yogi and Buddhist priests. Lacking archaeological or textual evidence to make this idea believable you need to find something in Jesus's message and say, "Aha! That can only be Buddhism!!" and I can't simply pull out my Bible and point to a direct analogy in the Old Testament. Jesus didn't need to travel to Uttar Pradesh to learn what could have easily been found in the local Nazareth synagogue.