no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States ...

Theocrat of the Week | By Frederick Clarkson Sun Apr 15, 2007
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Disgraced former Chief Justice of the Alabama Supreme Court, Roy Moore.!

Mr. Moore, Our Distinguished Panel of Judges note, is so vain, he still calls himself Judge, as do his cult followers, although he was thrown out of office years ago. ...
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... Moore believes that Rep. Keith Ellison (D-MN) is ineligible for the seat to which he was elected for the sole reason that he is a Muslim. Moore called on Congress to prevent him from being seated.

Mr. Moore bases his claim on two main ideas: One is that because some radical Islamic clerics think being a Muslim is incompatible with being an American Member of Congress, therefore it is. Quoting one of them, Moore declares: "While we certainly disagree with Idris' radical extremism, he at least knows what Islam is all about!"
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... all matters related to the oath of office, is covered in Article 6 of the Constitution:

The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States.