94:2.8

It was during the times of the writing of the Upanishads that Buddhism arose in India. But despite its successes of a thousand years, it could not compete with later Hinduism; despite a higher morality, its early portrayal of God was even less well-defined than was that of Hinduism, which provided for lesser and personal deities. Buddhism finally gave way in northern India before the onslaught of a militant Islam with its clear-cut concept of Allah as the supreme God of the universe.