First off, lets get back on tract. For the purpose of the question, all that exist is here and now, there is no after life. With that premise in mind, that is where you should launch your explanation.
@zenvelo Your premise is that there is no afterlife, but those who hold some belief about ghosts and spirits don’t agree with that premise. Any belief like that has no legs in this question. For the sake of the question the moment you die you vanish into wherever, if you believe you will or not.
Your statement about psychiatrists vs. priests also does not follow; exorcism does not cure mental illness. Those who believe in exorcism do not find the situation one of mental illness, but of demon/spirit possession of a person. It is if you put yourself in the spirit of the question. If someone believes their loved one or person they know is possessed that would mean by a evil spirit or demon, which in the spirit of this question do not exist. Which would mean that this possession is in their head, IE. a mental illness. So if the person who was going through this possession is rid of the affliction by the holy men (of a faith or religion that is all in their heads and not real) then in the spirit of this question they did for the person with the possession/mental illness what a shrink could not so.
@Ladymia69 In the spirit of the question, you summarize that those who see ghost concocted the vision from their psyche. And could that not be classified as having a mental illness? Just as if one thought they were made of iron and not simply possessed?
@crisw Prove that they can. You’re making a big assumption. IN the spirit of this question they logically can. However, if you know within the confines of the question something different, please elucidate.
@Symbeline I’ve never heard of a successful exorcism on a mental patient. Where does that come from? In the spirit and context of this question where would the possession come from? For the sake of this question the only life force that exist is us here and now, once you die it goes wherever; there is no life after here. Being that is the case for this question a person being possessed or having an exorcism performed on them have to be mentally ill as to why they are not acting normal or normal enough people don’t think they need help.
I remember seeing a ’‘haunting’’ photograph on the net with a written history about a ghost Lets go with that in the context of this question. What would the latent images be? Because once a person dies in the context of this question their life force (which outside the question would be a soul) just goes “bloop” and is gone. So what are they seeing?
we don’t know if ghosts and crap exist, and can’t use that as a barometer for something else that’s as equally unexplained, or not known about._* How can you have ghost if there is no left over life or soul of a person to create it? For the sake of this question, it would be impossible. If there is a ghost, what is it, if not a mental illness inside someone’s head?
For the e sake of the question clergy is no better or worse than a self-help guru nothing more.