Religion is more important for anything for Muslims, and you not realist but a baseless troll
No one is forcing Illegal Muslims to covert.
These are the options for them
1) Go back to their country of origin and continue to live as a Muslim
2) Live in a detention camp in India as a Muslim
3) Covert as either Hindus, Sikhs, Christians, Jains, Parsis or Buddhists to attain Indian citizenship and live a secured and prosperous life
The choice is theirs to make.