1. All the immigrants from Bangladesh are Muslims. According to BSF's statement thousands cross-over to West-Bengal and Assam.
2. Couple Thousands is not equal to a crore. If BJP somehow manages to remove crores of them from vote-list. Parties like TMC,Congress,Communists and Aiudf can't win many seats in ASSAM and WB. So that won't happen. Only in your chaddi-dreams
3. Most of them left between 70-90. Rest are converting as we speak.Even liberal party like Awami encourages conversion. Shed your tears already.
4. Again not worth debating. There are are 17-18 core Muslims in UP,Bihar and WB alone
5.Thousands of Muslim are converting? Where? More true statement would be crores of Hindus are converting to Christianity(by money) and Islam(genuinely).
Even in a city like mumbai, educated Muslims have atleast 5 children. Never seen a Muslim guy with less than 3 children ever. So I doubt rural Muslims are practising family-planning.