Pathan, Shekh , Sayyad are not casts. These are titles given to different tribes according to their ancestory. And let me tell you No Pathan is given preference over a Sayed or Sheikh or Jatt or Rajput, they are not discriminated viz a viz religious rituals neither they are untouchables.
All of them pray at the same mosque. All of then do eat togather.
I still don't get your logic...Discrimination is discrimination, be it sects, ethnicity etc etc. Have a look at ethnic violence in Pakistan, hell!!! for all you people blame Indian for Bangladesh, please dig deeper and see why they even wanted a separate state. Weren't Indian Muslims who moved to Karachi also part of similar discrimination? In fact would I be wrong If I said most cases of discrimination in Pakistan lead to death?
A little piece of knowledge, The Indian caste system, unlike what Pakistanis think as a concept is brilliant. Think about it, it was based on division of labor . Every economic unit/organization has a similar hierarchy even today!!!! alas!!! people used it for their own benefits.
It is also part of the cycle of change, There was a time when the higher caste ruled, but now its the turn lower caste , its still taboo for the rest, but look at ground realities, they get reservation for jobs and in education which many people in Indian have to work so hard for. That's a nice privilege don't you think?
Any way the point was..discrimination is discrimination!!! You can try and measure it, if you wish, but you are fooling yourself by saying Shia-Sunni divide is better than the cast system in India... While I can debate the discrimination between Shia and Sunni has cause more deaths. Hope you get the point