If Congress and the state has in some way become entangled, then the First Amendment should apply.
For example, public schools do receive federal funding. Congress/the fed gov't has inserted itself into public schools.
The question is: In what way is Congress/the federal gov't involved in state courthouses? That's not a rhetorical question, just a question.
It is those laws which must be declared null and void, not the free exercise of religion.
This is a logic expression that the Court has gotten wrong for the past 40+ years. They are supposed to be educated men and women, but they failed Logic 101, and continue to exhibit their pathetic failing.