The so-called seperation of of church and state only applies to Christoanity.
I think you are right.
However, the principle is correct.
To test it out, do what I suggested in my post above. Require students of all faiths to write and recite the creeds or articles of faith of opposite religions. See how parents react.
I bet you a lot of dollars the Muslim parents will be down at the school in an instant causing a ruckus.
If they allow it one way, then allow it the other way.
But the public school cartel are too chicken to try this out. They only go after Christians, as you said. That’s why we should force the issue. Go after Mulslim students in the same way, for example.