I am a Catholic psychotherapist. I would not say that contemplative prayer is an efficacious treatment at all in an of itself. It is, for my clients, something that I very strongly support and recommend, but prayer itself is not a treatment. Regarding behavior therapy, there are very few true behaviorists around these days, as mental health issues require a more complex approach than pure behaviorism can offer. Of course it depends on the exact nature of the client’s problem, but in using depressive and anxiety disorders as examples, Cognitive Behavioral Therapy is one of the more efficacious treatment approaches. Personally, I integrate Dialectical Behavioral Therapy and Acceptance and Commitment Therapy skills and theory with traditional CBT with good results. As part of that theoretical framework, I would likely have a client, especially a Catholic client, to utilize something like journaling and/or prayer practice as a ‘skill’ or ‘tool’. Any treatment, to be effective, requires deliberate and consistent work by the client. A therapist can have the best treatment recommendations to offer, but unless a client is willing to work at it, nothing will come of the treatment.
For a personal example of this, I have a cancer disease and have struggled with my life being threatened on a continual basis, with fear of the unknown, with both anticipated as well as current pain from my brain and spinal cord tumors, with PTSD from extreme and traumatic treatments for pancreatic cancer and watching my Dad die from the disease. I actively and deliberately use CBT, DBT, and ACT theory and practice, but adjunctive to that I utilize prayer deliberately to aid in coping with my illness. I should note that prayer is always part of my life as a spiritual practice and in using it as a mental health aid I not only experience benefits from prayer, but it has indeed supported and enhanced my faith in general. Just today I was undergoing treatment that was scary and painful, and to manage the fear and anxiety I prayed and meditated on the Our Father, Hail Mary, and my own desperate cry of ‘Oh God please help me’. I was able to manage (not get rid of) the anxiety and get through the treatment. I have found in these situations that it is focused prayer that helps me to, minute by minute, get through intense pain and fear like no other treatment or skill has been able to do. But this may not work in other situations or for other clients; all of therapy is finding what works for each person, helping the client to accumulate skills and tools to manage mental health problems so that they have an arsenal to pull from as the need arises. Regarding prayer specifically though, I believe that whether or not it has any efficacy in alleviating mental health symptoms it most assuredly MUST be a part of every Catholic’s life of practice and faith.