And Mohamed, by his own actions, did nothing to change that paradigm of barbarism. He set the example that can’t be replaced or surpassed.
Mohammed did make a change. He organized and controlled the barbarism, while preserving it.
He made all this ancient Arabian barbarism into a rigid system, and added the constraints of law. This is why Islam as interpreted in the strictest manner is legalistic and compassionless. Its also why its so hard to transcend the barbarism.
Unlike Christ, he did not create an Ethics.