What's the need to disclose one's religious beliefs? Religious beliefs are personal, most Pakistanis are Muslims and therefore believe in khatm-e-nabuwwat anyway. More importantly, how does any of this effect your own faith?
Pakistan wasn't built as a secular republic, nor was Islam used as a tool to subvert democracy and civilian institutions the way Zia did, and nor did Jinnah envisage the full implementation of Sharia the way mullahs who then opposed the creating of Pakistan would have us believe.
We know that Jinnah spoke at length about Islam and the identity of Pakistan. He also said this:
“You are free; you are free to go to your temples. You are free to go to your mosques or to any other places of worship in this State of Pakistan. You may belong to any religion, caste or creed—that has nothing to do with the business of the state.”
Note that he made no comment about an exceptions to Ahmedis and any others deemed heretics. It has nothing to do with the business of the state.