The simple truth is that no such thing as Christian psychology [1] exists. Look at the index of any psychology [1] textbook. There are listings for Freudian, Jungian, Behavioristic, Existential, Humanistic, Transpersonal, and many other psychologies, but no listing for Christian Psychology [1]. The reason is simple: There is no Christian who is the founder of a distinct school of psychology [1] known as “Christian.”
Links:
[1] https://www.thebereancall.org/taxonomy/term/56/psychology