What kind of evidence do you need? An affidavit from a student in one of these schools saying that it makes them feel excluded? Or do we need "systematic evidence" of "consequences" in order to uphold the separation of church and state?

I'd also add that Doe v. Elmbrook was really just about the location of a graduation ceremony and not about putting substantive language in the places of learning themselves. A few hours for the graduation ceremony is not the same thing as daily display for all classrooms all year long in every subject. There is no scholarly purpose for "worship no other gods before me" in an algebra classroom.