Looking at recent decisions, it's going to go badly for those of us who believe in the anti-establishment clause.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Congress shall make no law, this actually could be interpreted quite literally by the courts that it is perfectly acceptable for a state to not only establish a religion but to criminalize other beliefs.
I think this would be a 5-4 decision with SCOTUS. I think Barrett would be against it, because she is Catholic and would see that her beliefs may not be the ones promoted. Kavanaugh and Roberts could be a toss up.