this would not have happened if pakistani muslims remained in india. but then, whatever Allah ta'ala Will happens. rida and tasleem.
The root cause of all the intra-Muslim death and destruction in Pakistan are sadly the extremist takfiri mullahs of all sects who go around encouraging their followers to consider others 'kafir'...Stop this hate-preaching and you can stop terrorism in Pakistan. We need to learn to tolerate differences of opinion (like the great sayyid Mihr Ali Shah of Golra Sharif did (q)).
Sadly Pakistan - Madina-e-Saani-- has been hijacked by the Wahabi/Deobandi ideology since the time of Zia which has led to all the problems mentioned by AQ... But Pakistan has huge potential and insha Allah soon, once the terrorist--political-mullah--feudal-nexus has been dealt with the country can flourish since most Pakistanis still follow a tolerant, Sufi-based Islam, and most ulema stick to teaching the Deen and don't get involved in politics - and the country can fulfil the mission of the great Qaid.e.Azam marhoom and the vision of Iqbal (as a second Turkey). Pakistan Zindabad!
...and as long as India stays true to its secular roots -- thanks to the two great founding-father Nehruji and the Mahatma -- India's minorities will be fine. The problem will be if the Hindutva ideology is forced upon its minorities...as running a multi-ethnic country on a religious basis never works for long...
Pakistan - a great nation built in the name of Islam where "Muslims" routinely kill each other, shoot down each other's kids, blow up mosques and shrines, have benevolently disowned their own brothers (Bangladesh), and where people believe secular democracy is the greatest revenge (against Shari3ah).
btw, being forced to do kufr doesn't make one a kafir. there is the famous incident of sayyiduna ammar radiyAllahu anhu.