Then we respond with our own nukes and life on Earth ceases to exist.
What's your point?
Do you think that Russia or China would be willing to sacrifice all life on Earth for 1.2 billion Muslims?
(and btw, India's missiles do not have the range to strike America)
As for India...indeed, they do not have those kind of missles, so scratch them from the list.
As for the rest of them...would they be willing to kill everyone? We'd all like to think they wouldn't, but sometimes, the mind of Man is a twisted and warped thing.
Evidence: the aforementioned muslims.
It's a tough call.