No religious test shall ever be required as a qualification to any office or public trust under the United States.
I agree with Eugene Volokh that the No Religious Test clause doesn’t mean that no official making an appointment and no voter considering whom to vote for may consider the religious affiliation of potential appointees or candidates. In historical context, it was clearly designed to forbid “test oaths,” such as the Oath Against Transubstantiation, which intended to exclude people holdfing particular religious views (e.g., Catholics) from office by requiring all office-holders to take an oath that no member of the sect to be excluded could conscientiously take.
But I also agree with him that using someone’s religion as a campaign issue is un-American. Since Eugene tends to favor the Republicans, I’m especially gratified to see him calling a foul on his own side.
If the President of the United States, a Texas Republican, has any objections to the latest antics of the Texas Republican Party, he’s keeping quiet about them.