New article in Psychiatric Times by Simon Dein FRCPsych,PhD. Here are the useful checkpoints.
Evidence suggests religious involvement is generally conducive to better mental health, and patients with psychiatric disorders frequently use religion to cope with their distress.
Religious attendance has been associated with decreased suicide attempts in the general population and in those with a mental condition, independent of the effects of social supports. Not all religious variables and beliefs are related to better mental health. Exclusivity and extreme behaviors might be problematic.
Religious delusions have been associated with poorer outcomes, poorer treatment adherence, and more severe course of illness in patients with schizophrenia.
A professional's moral stance should be neutral, with no attempt to manipulate the patients beliefs.
My note on this is : The exception to this would be therapists/doctors who work with specific populations ie: Christian, Jehovah Witness, Indigo/Crystal. Or where the parents give permission to use cultural/religious/spiritual/philosophical beliefs to help shape desirable behaviors/ideas in children.