Indian religion had degenerated in such a way that became mere external idolatry.
Superior castes tyrannized the people infusing religious terror into them. Even images of gods, with awful aspect, monstrous heads and macabre postures did not infuse love or veneration but superstition and panic.
250 years before Jesus Christ, certain Buddhist missionaries went into China to preach the doctrine of the Exalted One.
There they were very kindly admitted, and very soon the new doctrine fused together with old extant religions.
The origin of Chinese civilization (Chun-Chin) are lost in the fog of Vedic times, because Vedas were those tribes settled on the rock of Chung-Yang, defeated their inhabitants, and assimilated them and adapted themselves to them.