That’s what I think we ought to start calling these state/church separation issues. A phrase like “violation of the Establishment Clause” might interest nerds who are into constitutional law and secularism, but it’s the kind of phrase that causes everyone else’s eyes to just gloss over when spoken.
Anyway, this particular bailout comes in the form of a very weird case that goes back to 1934, when a group set up a big cross in the Mojave Desert to honor the dead from the first World War. Nobody really noticed it for a while.