Re: What if -
Personally, I think that if you were to discount religion out of the equation, people would find other ways to discriminate; race, ethnicity, social status and so on.
Even if Pakistan were to eliminate Islam from its constitution what makes you think that people would stop killing in the name of it? lol in order to eliminate Islam from the constitution and actually have some peace - which I doubt, knowing how menial and pathetic the Pakistani mentality is - you would first have to eliminate corruption, many honor killings and what not go unnoticed in Pakistan every year due to lack of proper integration of our system and more importantly wide-spread corruption.
Religion has nothing to do with ill-mannered behavior, whatever it may be, its lack of several other things, such as education, morals, patience, etc…