After destroying Persia, Mesopotamia and Egypt, in seventh century Arabs encountered a new kind of kafir resistance.
Hindus like Nagabhatta, Bappa Rawal, Takshak, who would neither convert nor die, instead they k*ll when asked to convert.
But they also have no fixed ritual of worship, and worship Gods in all forms, mostly animals , and love to sing and dance when worshiping God.
They also very highly revere their ancestors and worship them.
So the believers quickly changed the tactic and #Sufis were born
Sufis who apparently worship graves, and sing and dance while doing so.
All three are explicitly banned in Islam, and even today are banned as soon as Muslims seize political power in a country (Please find out how Taliban ruled Afghanistan in 1990s)