Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof
That's it! They can't make laws establishing a religion. That was fundamental to the Framers, as the Church of England was an arm of the throne.
The Church and State theory is garbage and needs to be discussed and dismissed. It doesn't exist.
This is just silly. Who’s voice matters most?
If I protest the atheists protest does that cancel out their protest?
The ACLU (read Fabian Socialist) attack on all forms of organized religion is certainly not American. But in understanding the undermining of American culture, you need to recognize their diabolic victory in promoting our cultural demise, in extrapolating from a tolerance of dissent; to an absolute veto by dissenters, over the freedom of the majority to pursue their Faiths in religious ceremonies in public places.
See, for example, Leftwing Word Games & First Amendment Guarantee.
This has been a significant factor in undermining our sense of multi-generational purpose.