I have wasted a lot of time with you but I am willing to waste even more.
Jinnah in this particular speech is espousing the need for a fair, democratic, equal, and justice driven society by using Islam as the subtext.
There is no indication here that Islam will be the state religion or it will seep in the manner by which the religious clergy benefits.
Similarly, he had clearly pointed out that religion will remain a personal matter though it will be used as a source to create a just, equal, fair and democratic society.
What you want is a society where Mullah are running around passing decrees, calling people kaffir and indulging in all vices. Add to that the fact that they would want an everlasting war with the Non-Muslims.
Lets be honest here, Shias, Ahmadi's, Aga Khanis and substantial number of Parsi's, Christian's, Hindu's would not have opted for Pakistan if it was to become a reactionary medieval state where the clergy has a lot of sway over the nations get up.