From 1501 to 1505 Sikandar Lodi sacked Dholpur, a dependency of Gwalior, so thoroughly that trees and orchards extending to fourteen miles around wer… - K. S. Lal

The Hindus who naturally resisted Muslim occupation were considered to be rebels. Besides they were idolaters (mushrik) and could not be accorded the status of Kafirs, of the People of the Book-Christians and Jews.... Muslim scriptures and treatises advocated jihad against idolaters for whom the law advocated only Islam or death.... The fact was that the Muslim regime was giving [them] a choice between Islam and death only. Those who were killed in battle were dead and gone; but their dependents were made slaves. They ceased to be Hindus; they were made Musalmans in course of time if not immediately after captivity ... slave taking in India was the most flourishing and successful [Muslim] missionary activity.... Every Sultan, as [a] champion of Islam, considered it a political necessity to plant or raise [the] Muslim population all over India for the Islamization of the country and countering native resistance.

Any study of the population of the precensus times can be based only on estimates, and estimates by their very nature tend to be tentative.

The early inhabitants of Eastern Bengal and Assam comprised of Garos, Rabhas, Mechs, Mikris, Lalungos, Lushais, Kukis, Koches, Manipuris, Nagas, Khasis, Miris, Ahoms and many others. Before some of them became Muslims and Christians, they were all reckoned as Hindus, For example, Ahoms (a Shan tribe) willingly converted to Hinduism from ‘Animism’ (an artificial differentiation from Hindus created by British anthropologists and administrators). These tribes worship a whole pantheon of Hindu gods and godesses. They celebrate Holi, Rath Yatra, Janmashtami, Kali and and Baisakh Bihu or the advent of the Hindu new year....