Religion as a mental illness

[AFTT47]

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.

Good point. You can diagnose a physical cause of a delusion and that will be objective. And in the vast majority of people, religion (or any other non-rational belief) has no physical cause as a result of a physiological malfunction but of the general limitations of our species.