Not only is it not unconstitutional to close the mosques,
it is unconstitutional to allow them to be open, and that has been the case for 226 years. Islam is a supremacism. It is the largest and most clear-cut supremacism in the world. As such, it is 100% ILLEGAL/UNCONSTITUTIONAL, so says US Constitution Article 6, Section 2, the Supremacy Clause >>
"This Constitution, and the Laws of the United States which shall be made in pursuance thereof; and all treaties made, or which shall be made, under the authority of the United States, shall be the supreme law of the land; and the judges in every state shall be bound thereby, anything in the constitution or laws of any state to the contrary notwithstanding."
What part of the First Amendment sails over you America-haters' heads?
Read it again:
Amendment I
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
Where do you North Koreans get the authority to shut down a religion without a law?
What part of the Supremacy clause sails over your America-hating head ?
Read it again:
"This Constitution, and the Laws of the United States which shall be made in pursuance thereof; and all treaties made, or which shall be made, under the authority of the United States, shall be the supreme law of the land; and the judges in every state shall be bound thereby, anything in the constitution or laws of any state to the contrary notwithstanding."
And since your professors didn't explain it to you (or you were sleeping when they did),
NOTHING trumps the Supremacy Clause, including religions, ideologies, cults, etc. and (unlike the weak 1st Amendment, which has numerous exceptions), the strongest part of the Constitution, the Supremacy Clause has NEVER has a single exception to it, in 226 years. Back to the classroom fro you.