Saying you will do one thing, then doing something contrary is left wing extremeism to the core. There is nothing wrong with passing judgement on a behavior (not a person) that is forbidden by scripture. That it not a public school, but a private Christian one.
In addition, Florida is a right to work state. An employer can fire you for the color of your eyes or for no reason whatsoever, if they like. That includes Christian school employers, by the way.