explain to me why would you separate a secular state from a secular state? on basis of what?
In the end, I think this is the bottom line. If religious Muslims will be marginlized in a secular Pakistan, then why on earth not bother remaining an Indian?
Again, the answer lies somewhat in the origins of Pakistan...the so-called Two Nation Theory, which posited that the Muslim Nation on the Indian subcontinent, their way of life and religion, was existentially challenged by a Hindu majority.
Modern proponents of a secular Pakistan like to engage in some revisionist history, suggesting that the TNT at it's heart was a matter of preserving an ethnic community, based on religion (e.g. Jews), and not necessarily the religion itself.
This is easily debunked, a the chief ideologues of TNT invoked a danger to Islam itself in a unified India, not some abstract and unrealized Muslim "ethnicity". Further, the Muslims of India hardly formed a coherent group, covering a myriad of cultures and languages...the only real commonality was in religious practice and social customs.