*Saying that somebody is attempting to establish a Theocracy in the USA is absurd.
Especially, in the form of fragmented Christianity that exists, that somehow you and others attempt to lump into a category of scary "Christian Nationalists", or WASP's, or lumping in a Catholic like Bannon in with WASP's based on his mottled complexion. Bizarre.
There is very little they agree upon further than God exists.
For example:
The nation of Belgium, where the EU meets, has as it's official state religion, President Biden's religion, Roman Catholicism, with the Pope as it's spiritual guide on earth. It has established that as it's national religion. In a similar way, The UK, with it's Anglican/Episcopalian Church of England has as it's spiritual guide on earth, King Charles III. Effectively, the Pope of the CofE.
Protestant Orangists, originating in Henry VIII and modified by William of Orange.
These are but 2 examples of state sponsored religions, Belgian Catholic, and British CofE.
The U.S. Constitution, as you astutely point out, says that their will be no establishment of an official state sponsored religion. There has not, nor will there ever be in the USA.
It is akin saying someone is attempting to establish a Monarchy in the USA.
BTW, people are free in the USA to think and express with speech either of those notions.
Good Luck with succeeding at that, though. Or, anyone taking such seriously.
It may be just as likely that a group might attempt to eliminate religion altogether,
via Utopian Globalism ideals of a godless Marxian-Socialist movement,
in the footsteps of Lenin & Stalin, via the ideas of secular Henry Kissinger (rest his soul)
that is just as plausible a notion as an attempt at
"Christian Nationalism" Theocracy in the USA .