Threaten?
If you truly believe there is only one way out, what sense does it make to remain silent? By remaining silent, you are complicit in their deaths. Even if you call out and no one comes, you have done what you could.
Using compulsion to convert is ridiculous. You cannot force people to believe.
It is more than threaten. It is murder!! The Christian inquisition of Goa, the two hundred years of british rule that involved conversion, terrorism by radical christian groups in nagaland and tripura are not examples of peacefully pointing out a door. lol. You make Christianity sound like Buddhism. Christianity has indian blood on its hands.