What percentage of india's population is punjabi or sindhi?? Definitely not more than 5%
Read my previous post again. Punjab and sindh have nothing in common with india when it comes to culture
Does it matter? There is a Punjab + Haryana + Delhi states in India. Many of the Indian members posting here are Punajbi Indian, obviously they comfortable enough to be part of this community. As for Sindhis, they linked to Punjabis/Rajasthanis/Gujaratis of India. Sindhi hindu community is largest in Pakistan and many who migrated to Indi,play an influencial role there.
Now lets look at the Kashmiris, they a relatively self enclosed due to the geographic isolation. Pakhtuns have obvious links to Pakhtuns in Afghanistan. Same can be said about Baluchis with regard to Iran, Afghanistan. Besides Pakhtuns and Baluchis are Eastern Iranian peoples while Sindhis and Punjabis are mixed Indic in their background.
Again its not religion thing but a culture thing. It just so happens that Punjabis, Sindhis.Pakhtuns, Baluchis and Kashmiris are all heavily Muslim which makes the foundation of Pakistan solid.