How strange that you can't find it (HA HA HA HA), when I've been posting it left and right IN THIS THREAD, over & over. what's the matter ? Lost your reading glasses today ? I've probably posted alltogether in this forum (despite my being new here) over 100 times.
Well OK, Mr. NOT QUITE WITH IT. Here is your law that bans Islam (and any other supremacist ideology as well)
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, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."
PS- Islam is also banned by virtue of US Codes 2384 & 2385. Here THEY are.
18 USC § 2384 - Seditious conspiracy
"If two or more persons in any State or Territory, or in any place subject to the jurisdiction of the United States, conspire to overthrow, put down, or to destroy by force the Government of the United States, or to levy war against them, or to oppose by force the authority thereof, or by force to prevent, hinder, or delay the execution of any law of the United States, or by force to seize, take, or possess any property of the United States contrary to the authority thereof, they shall each be fined under this title or imprisoned not more than twenty years, or both."
18 USC § 2385 - Advocating overthrow of Government
"Whoever knowingly or willfully advocates, abets, advises, or teaches the duty, necessity, desirability, or propriety of overthrowing or destroying the government of the United States or the government of any State, Territory, District or Possession thereof, or the government of any political subdivision therein, by force or violence, or by the assassination of any officer of any such government; or
Whoever, with intent to cause the overthrow or destruction of any such government, prints, publishes, edits, issues, circulates, sells, distributes, or publicly displays any written or printed matter advocating, advising, or teaching the duty, necessity, desirability, or propriety of overthrowing or destroying any government in the United States by force or violence, or attempts to do so; or
Whoever organizes or helps or attempts to organize any society, group, or assembly of persons who teach, advocate, or encourage the overthrow or destruction of any such government by force or violence; or becomes or is a member of, or affiliates with, any such society, group, or assembly of persons, knowing the purposes thereof—
Shall be fined under this title or imprisoned not more than twenty years, or both, and shall be ineligible for employment by the United States or any department or agency thereof, for the five years next following his conviction.
If two or more persons conspire to commit any offense named in this section, each shall be fined under this title or imprisoned not more than twenty years, or both, and shall be ineligible for employment by the United States or any department or agency thereof, for the five years next following his conviction.
As used in this section, the terms “organizes” and “organize”, with respect to any society, group, or assembly of persons, include the recruiting of new members, the forming of new units, and the regrouping or expansion of existing clubs, classes, and other units of such society, group, or assembly of persons."
PS - Maybe you hadn't heard but there a whole lot of things that "go directly against the 1st amendment" For example, in the 1st amendment's free speech category, we have slander, libel, perjury, sedition, conspiracy speech of various types, obscenity law, fighting words, inciting a riot, etc. All examples of speech. All ILLEGAL. The 1st amendment, with its many exceptions, is the weakest part of the Constitution. The supremacy clause, with zero exceptions, is the strongest. Also, since Islam is not a religion, it has no connection to the 1st amendment, other than being in total contradiction to it.