Psychological aberrations do occur and may respond to therapy.
And perhaps blokes in long frocks waving beads, and flicking water around might help some people.
Though demons are a metaphor for psychological aberrations.
Rather than psychological aberrations being a metaphor for your actually demon.
A better approach to such issues, is perhaps medical therapy and a moderated approach to counselling.
It's perhaps best if the Church sticks to what it knows best.
Selling fairy tales to children and grown up children.
And leave the medical and psychological therapy to those grounded in the realism of mental health problems.