On the other hand, I read somewhere, sometime, that after the Muslim invasions of India/Pakistan, those areas that earlier had been Buddhist, were those that most easily were converted to Islam. The reason was said to be that most of the learned Buddhists were concentrated in large centers like for instance Nalanda, so that when these were destroyed, Buddhism no longer had any footing in those districts, and therefore they fell to Islam. While Hinduism, on the other hand, had a more substantial footing at the village level.
I do not know if this is true or not. Anyone who knows?