I don't think you have lived in Pakistan and experienced any interaction with Pakistani minorities.
Pakistani Christians are fully assimilated. Their dress, language, and even names are just like any other mainstream Pakistani. Christian run schools, hospitals etc. follow strict rules about not preaching to Muslim kids. And they have been doing so long before the Talib madness gripped the country.
Pakistani Hindus are in such a small number and yet you can't look at a Pakistani-Hindu and quickly tell him apart from his Muslim neighbor as per his dress or language etc.
The same is true for other minorities as well. None of them behaves like the Arabs (discussed in this thread). How many Muslim Arabs living in the West name their kids James, Bob, or Jack. You can find most of the middle class Pakistani Christians with names like Anwar, Akram etc. And in some cases they have Mohammad and Allah as part of their names.
So what else you want from them as far assimilation in Pakistan is concerned?
Aren't you comparing Oranges to Grapes with that association?
While you are right that even minorities assimilate quite well in Pakistan, but it is by choice. They choose to dress in the national dress and have the names they want to have because they want to mix in as much as possible.
Lately the urban trend is such that Tight jeans/short t's and such are a common sight (yes i'm talking about Pakistani girls). While the society overall is still conservative, but it does shed light on the fact that one can be as he/she wishes within their own confines.
Those who are fond of extreme western dress code are not prohibited from citizenship in Pakistan.
Then why would someone, a french immigrant be prohibited from citizenship due to his/her dress code? Unless, for the millionth time, there is a law that clearly states such, then there are no surprises later.
The few christians in Pakistan i have come across wear the Pakistani label proudly while maintaining christian names such as Venus, Caesar/Qaisar, etc. They choose to dress Pakistani because they, themselves want to blend it. If they wore Pant/Shirt, etc...i'm sure no one would stone them because western dresses are a norm everywhere.
The point is real simple, if anyone is to be refused citizenship on the basis of dresscode, and such ruling is not a LAW in place when he/she applies....it's discrimination. And disrimination of such level really makes the slogan of 'liberal, freedom yielding' look rather tainted with selectiveness.