Is there really a way to tell where the majority of bitcoin holders reside? I don't think so. Bitcoin doesn't know nor care about nationality, country, religion, continent... It is a universal borderless currency. Maybe there are indirect ways to correlate users with countries, but that would be very hard to do accurately.
What do you mean by bitcoin was born in Asia? Because of the name Satoshi Nakamoto or do you have some other argument?
maybe what he meant was satoshi nakamoto as the pioneer of the creation of bitcoin. that might be the argument for him. because sathosi is Japanese. that's my opinion
no one know who is this "satoshi nakamoto" is he/she really a person who live in Japan or not, no one will ever know, and since he's gone many people claiming them self as satoshi nakamoto