"That men imbued with Sufi doctrines early came to India there cannot be the slightest doubt ; but who these earliest comers were, or when they arrived, cannot be definitely ascertained. Sind, the first province of India to be invaded by Muslim armies, was also the first to be occupied by Muslim mystics, so that to-day it rightly claims the distinction of being the home of Indian Sufism. Nevertheless, no matter where one goes in India or Pakistan one finds Sufi influences powerful and active, fostered, no doubt, by the similar pantheistic doctrines that abound in Indian religious thought, which provide a very congenial atmosphere for their growth. In fact, because of the very widespread dissemination and influence of Sufi doctrines, attempts have been made by some Muslim theologians to find a way of reconciling them to orthodox Islam."
January 1, 1970
https://en.wikiquote.org/wiki/Sufism_in_India