Religion vs Language: A volatile political atmosphere in West Bengal

On May 4, 2014, then BJP's prime ministerial candidate, Narendra Modi, distinguished Bangladeshi Hindu migrants from the Muslim ones by using the word 'refugee' for the former — “those who celebrate Durgashtami” — and “infiltrators” for the latter, "who are pouring in due to vote-bank politics". The former must be given protection and the latter driven out, he had said.
 

The BJP cites the data from Census 2011 to point to the increase in the state's Muslim population share, attributing it to “infiltration” from Bangladesh. It projects this share will be around 30% in the next census. It also claims