In Mere Christianity, Christian thinker C.S. Lewis argued that you cannot regard Jesus as a moral teacher if you deny his divinity.
A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic—on the level with the man who says he is a poached egg—or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God: or else a madman or something worse. [Emphasis added]
Informed by Lewis’ so-called “Lunatic, Liar, or Lord” trilemma, atheist filmmaker Peter Breinholt produced a short documentary “Madman or Something Worse.” Breinholt contends that most of Jesus’ moral contributions were not original, and that most of his original contributions were not moral.
Here is part 1 of the film: