How Centre distinguished migrants who faced religious persecution?

Questioning the rationale behind choosing only three countries for giving citizenship to minorities facing persecution there, Leader of Opposition (LoP) and senior Congress leader Ghulam Nabi Azad asked the government why it was selective in countries and religion in the controversial Citizenship Amendment Bill.
In reply to a question on how many people of minority communities were persecuted in Pakistan and Afghanistan after 1947 and in Bangladesh after 1971, the Home Ministry said that it did not have authoritative statistics.