Mocking religion does not interefere with its free exercise.
How interesting that you call me a "Mullah," when you defend the "right" of this professor to abuse his authority by infringing on freedom of religion, while I am arguing for the free exercise of religion.
How did the professor interfere with free exercise?
"Mocking religion does not interefere with its free exercise."
It can. Free exercise includes equal access to public facilities. Making believers objects of mockery impairs their equal access.
"How did the professor interfere with free exercise?"
By attempting to make believers objects of mockery, thereby impairing their equal access to the university.