1 - Christianity was already in sharp decline before immigration.1 If we kept better control on immigration Christianity wouldn't be in danger of becoming a Minority
2 None but it's our religion that goes back centuries and should be preserved do you think Pakistan would embrace becoming a Christian Country?
3 No
2 - See point 1. Regarding your other question, you’d have to ask people living in Pakistan. And I mean, actually speaking to them, not just assuming a conclusion that further fuels your mindset.
3 - Good. Perhaps taking people at face value rather than categorising everyone of a certain background, faith or belief as bad or evil, is a better way of getting through life.