The actual official pantheon of gods with worship generally directed at either Shiva or Vishnu tends to work more as an official state religion kind of thing-
I read on Britannica that the Hinduism which spread to Champa was Shaivist, FWIW. Sorry I can't comment more, but I am not
that knowledgeable about Hinduism.
think Hendryk should redo His map to include Formosa in the Arc.
I think this increaced Hindu Arc would prevent Islam from getting such a grip on Indonesia
It may also lead to more European Contact with Northern Asia in the 15~1600's.
A English or French settlement of Sakhalin Island. Don't dismiss the possibility, OTL it was a Focus of the Fur trade in the late 1700's~early 1800's.
A 1600's French Sakhalin would totally Butterfly Asia to the point of non-recognition.
As discussed earlier, there is a definite chance that in the centuries after the POD, Islam will be butterflied away.
And as for the last part, are you reading a different thread? If Japan is Hindu, Asia is
already past the point of non-recognition. Speculating on what changes would happen thousands of years after and how that would change Asia is moot, already we would recognize next to nothing.