"That same popular preference for polytheism, miracles and myths which destroyed Buddha’s Buddhism finally destroyed, in India, the Buddhism of the Greater Vehicle itself. For—to speak with the hindsight wisdom of the historian—if Buddhism was to take over so much of Hinduism, so many of its legends, its rites and its gods, soon very little would remain to distinguish the two religions; and the one with the deeper roots, the more popular appeal, and the richer economic resources and political support would gradually absorb the other.... The final blow came from without, and was in a sense invited by Buddhism itself. The prestige of the Sangha, or Buddhist Order, had, after Ashoka, drawn the best blood of Magadha into a celibate and pacific clergy; even in Buddha’s time some patriots had complained that “the monk Gautama causes fathers to beget no sons, and families to become extinct.” The growth of Buddhism and monasticism in the first year of our era sapped the manhood of India, and conspired with political division to leave India open to easy conquest. When the Arabs came, pledged to spread a simple and stoic monotheism, they looked with scorn upon the lazy, venal, miracle-mongering Buddhist monks; they smashed the monasteries, killed thousands of monks, and made monasticism unpopular with the cautious. The survivors were re-absorbed into the Hinduism that had begotten them; the ancient orthodoxy received the penitent heresy, and “Brahmanism killed Buddhism by a fraternal embrace.” Brahmanism had always been tolerant; in all the history of the rise and fall of Buddhism and a hundred other sects we find much disputation, but no instance of persecution. On the contrary Brahmanism eased the return of the prodigal by proclaiming Buddha a god (as an avatar of Vishnu), ending animal sacrifice, and accepting into orthodox practice the Buddhist doctrine of the sanctity of all animal life. Quietly and peacefully, after half a thousand years of gradual decay, Buddhism disappeared from India."
January 1, 1970
https://en.wikiquote.org/wiki/Decline_of_Buddhism_in_the_Indian_subcontinent