[SappyAppy]

In general terms, I agree with the article. The development of the traditions are -mostly- due to a process of adoption and adaptation of a teaching from the culture of the country or ethnic group where the teaching arrived and in both directions.

It is nothing new in the history of mankind and it is a common human process. Humans are humans because of culture. Culture is the way humans adapt to an environment that threatens them.

All religions are about this. For example, Chinese 'buddhism' is about the ways and manners with which Chinese people has adapted and adopted teachings. The bigger the distance a teaching has had from its origin, the greater the clarity of the cultural features that distinguish it.