"After class, Doe approached Meriwether and 'demanded' that Meriwether 'refer to [Doe] as a woman' and use 'feminine titles and pronouns.'"

"This was the first time that Meriwether learned that Doe identified as a woman. So Meriwether paused before responding because his sincerely held religious beliefs prevented him from communicating messages about gender identity that he believes are false. He explained that he wasn’t sure if he could comply with Doe’s demands. Doe became hostile—circling around Meriwether at first, and then approaching him in a threatening manner: 'I guess this means I can call you a cu--.' Doe promised that Meriwether would be fired if he did not give in to Doe’s demands."

From Meriwether v. Hartop (6th Circuit, March 26, 2021), via "Professor who refused school order on transgender student’s pronouns wins in court" (NY Post). 

It was a motion to dismiss, so the facts stated above are the plaintiff's allegations, presumed true and with the inferences all going toward the plaintiff. The professor will be able to go forward with claims based on freedom of speech and freedom of religion.