(The Sufis) established their khanaqahs on the sites of Buddhist shrines, and (it) fitted well into the religious situation in Bengal.
Source, in full
Levtzion N (1979) in Conversion to Islam, p. 18 (in Iran, N. Levtzion ed., Conversion to Islam, Holmes and Meier Publishers Inc., New York,) quoted in Khan, M. A. (2011). Islamic Jihad: A legacy of forced conversion, imperialism and slavery.Ch 4