The First Amendment- Prohibits making any law respecting an establishment of religion, impeding the free exercise of religion. That is just covers Freedom of Religion in the United States under the First Amendment.
I don't like blogging about Donald Trump, because he's not a real presidential candidate. He's simply looking to further his own one-man reality TV career and perhaps get another book and documentary that of course is all about The Donald. As if there's nothing else going on in the world and no one else to write about. And if you watch CNN on the regular basis, you might get that impression from them anyway. But The Donald is pandering to a group of Americans on the Far-Right inside the Republican Party who believes only they have Freedom of Religion in America. And everyone else is subjected to what big government will allow them. Karl Marx would be proud.
The Republican Party and I think the establishment has already figured this out, but the party as a whole needs to decide are they going to be a party of Freedom of Religion, or are they going to be a fascist party that only tolerates religion and speech that they agree with. In other words is Freedom of Religion real for all believers and non-believers, or just for fundamentalist Evangelical Christians. Does Freedom of Speech cover all speech including offensive and critical speech of minorities, but speech that could come off as even anti-American to Democrats. Or just speech that Republicans agree with. Do Republicans want to be a party of freedom, or a fascist party that only supports the rights of people that Neoconservatives and the Far-Right already agree with.
With The Donald, again a one-man reality TV star that is keeping CNN and MSNBC in business all by himself, but shouldn't be taken seriously as a presidential candidate. But the Far-Right, the Ann Coulter's, Alan Keyes, Pat Buchanan's, etc of the world actually believe in this, garbage (to be kind) and would have no problem with either shutting down Mosques and rounding up all Muslims and perhaps Arabs in general. Either through executive force, or passing a couple constitutional amendments to do that, because neither one is constitutional right now. And that is what makes a pander and demagogue like Donald Trump dangerous. Because he will never come within a thousand delegates or more of winning the GOP nomination for president, or 270 votes of winning the Electoral College of winning the presidency as an Independent. But there plenty of people out there on the Far-Right who take him seriously and are using him for their own means.