“Christian psychology” as the term is used today is an oxymoron. The word psychology no longer speaks of studying the soul; instead it describes a diverse menagerie of therapies and theories that are fundamentally humanistic. The presuppositions and most of the doctrine of psychology cannot be successfully integrated with Christian truth. Moreover, the infusion of psychology into the teaching of the church has blurred the line between behavior modification and sanctification.
John MacArthur