The Citizenship (Amendment) Bill incorporates the BJP’s articulated ideological position vis-à-vis undocumented immigrants in respect of three countries — Bangladesh, Pakistan and Afghanistan. The ideological position of the ruling party is that undocumented immigrants belonging to Hindu and other religious minority groups in these three countries cannot be treated as “illegal migrants” in India and need to be granted citizenship, while the Muslims among them are “infiltrators” must be identified and driven out.
The BJP introduced the Bill in Parliament in 2016 when the NRC was being updated in Assam. The objective of the Bill is very clear: to remove the “illegal migrant” tag on members of six religious groups — Hindus, Jains, Christians, Sikhs, Buddhists, and Parsis — from these three countries and reduce the requirement of residency in India to six years to make them eligible to apply for Indian citizenship.
source: https://www.thehindu.com/opinion/op-ed/the-smokescreen-of-an-infiltrator-free-india/article27004848.ece?homepage=true