Religion is a harmful addiction. If it is used in place of mental health treatment, then the treatment is worse than the illness. "Religion ... is the opium of the people." -Karl Marx. It is not a treatment for mental illness, eg. it is not a cure for depression. The withdrawal symptoms from religion alone can cause psychological trauma. When a sufferer of depression, anxiety etc. realises that religion isn't helping, the sufferer is worse off than before. Religion hacks into the autonomic nervous system and the endocrine system to create temporary euphoria, happiness, and a sense of calm, but like all addictions eventually the drug stops giving the high and the religious person goes through the religious motions just to feel normal.