What happens if Islam becomes the majority religion in America?
There is already a Muslim mayor of London, so don't think it's not possible. That same mayor just announced, in response to the recent terror attack on Parliament, that such things are part of the price for living in a big city and that people should get used to it.
The first thing that will happen in a Muslim-majority America is that the 1st amendment to the Constitution will come under attack. Long before that, Islam will have become a major religion among the U.S.Congress and the several statehouses, and that's where the process starts. Either 2/3rds of both houses propose an amendment or 2/3rds of the states call for a convention. Why the 1st amendment? Well, technically anyone may broadcast or print negative words about the Prophet. This cannot be tolerated in an Islamic country or by Muslims anywhere. The first has got to go.
"The First Amendment to the Constitution is hereby repealed." If 3/4ths of the states, either by ratifying convention or by the legislatures ratifying on behalf of the people, accept this, it could then become a crime to speak against the Prophet or Islam, even if what you say is true. There would be no escape, either, for those who merely make such remarks among family and friends because, as we have seen from recent events, the government has the ability to spy on us even in private via our phones and television sets, and that spy apparatus would be in the hands of a largely-Islamic government.
It would then also be possible to have a state religion, and it would be Islam. As in nearly all other Islamic nations, the practice of other religions would be forbidden. Media outlets that took adverse positions could be lawfully shuttered. There would be one voice throughout the land, and it would deliver a single message, and the Republic would be no more.
There comes a point in such a struggle that the tide sweeps the victor onward to inevitable victory, and we are too, too close to that point for comfort.
"If you will not fight for right when you can easily win without bloodshed; if you will not fight when your victory is sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival.
"There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves."
— Winston Churchill