An argument that emerges now and then on this website has to do with the nature of the ancestors of Indian (South Asian) Muslims. Where they Hindus? Much hinges on semantics. The term “Hindu” after all simply meant Indian in the days of yore, so by definition, they were.
On the other hand, Hindu today denotes a set of beliefs, practices, and identities, which exists at counterpoint with the confessions of Islam, sects like Jainism and Sikhism, and the dharmic world religion of Buddhism. To say that the ancestors of Muslims were Hindus may not give the correct impression due to the fact that that implies a level of fidelity to practices and beliefs which we today recognize as Hindu. Even setting aside the fact that substantial numbers may have been adherents of counter-cultural sects such as Buddhism, many of the threads of contemporary Hinduism developed in situ in the Indian subcontinent at the same time as many regions became predominantly Muslim.
And yet I think I have come to an elegant and accurate solution to this problem: those of us of Muslim origin or belief should simply admit that we were the descendants of idolators. Whether Buddhist, caste Hindu, or animistic peasant, from a Muslim perspective all these groups are idolators.