Religion as a mental illness

[Cephus]

You can be mentally ill and not delusional and delusional but not mentally ill. Society sets the standard.

But that really is the problem, isn't it?  The determination is entirely subjective, something that we don't do with other medical diagnoses.  Either you have cancer or you don't.  What people in that particular area think about cancer is irrelevant.  How many people have cancer in that area is meaningless.  You either have it or  you don't. But psychological diagnoses are subjective.  They depend on what others in the area consider normal.  They depend on a subjective determination of whether they're a danger to themselves of others.  If you live in an area where everyone believes in unicorns, you're not delusional because your delusions are commonplace.  That's utterly stupid. Society doesn't get to set the standards for reality.  Reality exists regardless of what society wants.  That really makes psychology a pretty pointless pursuit.