I went to a Baptist university. Even though all the faculty didn’t have to profess to be Baptist, the professors were expected to treat their colleagues and their students with respect, conduct themselves in an ethically and morally consistent way with the school’s Christian mission, and so on.
Your Christian school probably has a similar code of conduct that the teachers need to adhere to. Just like there’s a code of conduct for students, there’s one for teachers. Go get a copy, and that will help you write your letter.
No one’s going to lose their job or get in trouble on just one issue. The first step is usually a verbal reprimand. But the important thing is to start a paper trail, to help protect not just you, but future students from inappropriate behavior, and to alert the school in general that there’s a problem in the classroom.
(Anecdote time: At the end of each semester in undergrad, we got to review our professor. My Biblical Archaeology professor was always talking about “nuts”. He’d say, “Most scholars think X, but Scholar A says Y, based on this linguistic evidence. Scholar A is such a nut. No one takes him seriously.” And so I wrote a pretty harsh review, because I’d prefer it if he knocked down Scholar A’s argument in a scholarly way, rather than presenting the reason for the opinion, calling it nuts, and moving on with the lecture. The next semester, I had a Near Eastern Studies class with him that covered a lot of the same material… and when we got to Scholar A, he was very careful to go out of his way to debunk Scholar A’s opinions in an academic manner, rather than dismissively. It was really cool to see. So rather than worrying, “Oh, he’ll get in trouble with the Department Head if I criticize his lectures–!” , instead, future classes were much stronger, because he changed his lecture style as a result of the criticism.)
