Actually, it is very clear that America does not advocate for a state Church.
It would not matter whether or not Calvin advocated for a state Church or not.
America, however according to the Pledge of Allegiance is “One Nation under God”.

It would appear then that you agree with some Christians and secularist that say, “the American experiment is dead.”
Why does Scripture (particularly Romans 13) state that the magistrate get’s its authority from God? And why does it indicate that the magistrate is accountable to God?
I have listened to quite a few sermons on Romans 13 now. One really good one was a series by Samuel Waldron,on the passage. They indicate the same thing.
Yet, I have also listened to the other side on Romans 13, that disagree with Samuel Waldron. One in particular by a prominent figure in T4G, that indicated that the government was in their right to do what they did during Covid.
In the process the slamming John MacArthur.



England however had one state Church and that is why people like non compliant Baptist pastors like John Bunyan were thrown into prison in the mid 1600s.
America still was founded with the law of God as the founding principle. Yet, stayed away from a state Church, for reasons like that.


My understanding also, is many of states originally had their own constitutions. That were very straightforward about God being their foundation.
I maintain that, a country does not need to have a state Church for these principles to work.