"That seems to cover the same bases as separation of church and state in both directions. How do you suppose the United States could become an Islamic nation when founding a theocracy is illegal in one of our founding documents?"
That is how you are interpreting the first amendment. The wall is a one way wall. People in the private sector, including churches, can go through that wall but the government cannot.
Here is what the founders meant:
The establishment clause - this simply meant that the Federal Government would not create a church as part of the government. So many people in Europe were living in countries where part of their taxes went to a religion that they were not a member of.
Thomas Jefferson said, "To compel a man to furnish funds for the propagation of ideas he disbelieves and abhors is sinful and tyrannical."
The quote was about a state religion but I think this applies to just about everything the government thinks we must pay for.
Would it surprise you to know that there were about 4 or 5 states after the Constitution was ratified that had a state religion? I don't remember the states but I think Maryland was one of them and I think Catholicism was their state religion. I could be wrong because my memory sucks the older I get.
The free exercise clause - meant that the government would not make any laws regarding any religious practices. However, there are exceptions. Peyote is another exception. It is used in many American Indian rituals but because it is a controlled substance those tribes had to forgo its use in their ceremonies.
The free exercise clause is Jefferson's wall, and it is very specific that the first words in the 1st amendment apply to all the clauses. "Congress shall make no law..."
I haven't heard anyone recently talking about ending the second amendment with regard to churches. From time to time I've heard people talk about taking away the tax exempt status of Churches. But they would have to change the constitution because "Congress shall make no law...". Our current taxation scam should have never been forced on us. It was done by a narcissistic control freak, President Woodrow Wilson. He also forced the Federal Reserve on us.
I have heard leftists (not politicians) complain that conservatives should not have free speech. I am pretty sure the DSA would tear it down with the rest of the Constitution. The DSA has pretty much taken over the Democrat Party.