The Constitution is the law of the land. If you don’t agreement maybe you should move. With the Religious Right and Christian Dominionists having taken control of many state and local governments. Trump with others in Congress more than happy to ignore The Constitutional separation of church and state for votes, we are far more at risk of a militant Christian takeover of our government than Muslims. And the difference in their approach would be minimal.
In case you were still confused about why your illogical fear is unConstitutional here is the reason:

The No Religious Test Clause of the United States Constitution is a clause within Article VI, Clause 3. By its plain terms, no federal officeholder or employee can be required to adhere to or accept any particular religion or doctrine as a prerequisite to holding a federal office or a federal government job. It immediately follows a clause requiring all federal office holders to take an oath or affirmation to support the Constitution. This clause contains the only explicit reference to religion in the original seven articles of the U.S. Constitution.

You can be elected to office regardless of your religion or lack thereof by law.