The more strident atheists on the board and in the world at large occasionally make comparisons between religious belief and psychiatric illness. I'm going to assume that they are not just trying to make meaningless slurs, but think they have some sort of a point.
Although these people's understanding of religion and psychiatic illness apears not to be very great, they have latched on to the idea that religion is some sort of psychosis, and have compared it to the psychotic aspects of schizophrenia (though perhaps unknowingly).
One of the hallmarks of psychosis, perception without external physical stimuli, is often compared with religious experience. However, such 'halucinations' are a poor indicator of mental illness, since the majority of people who experience them (even if you exclude those cases that can be explained by nuerological damage or abnormality) are in no way mentally ill. Most 'halucinations' are not maladaptive, a fact that should be readily apparant when one takes into account that about 40% of people report having had hallucinatory experiences.
However, such experiences are certainly not required to indicate psychotic mental illness. Irrational thoughts that cannot be displaced by rational argument are also indicators. Now let us assume that religious belief is irrational and not suseptible to rational argument. This still does not indicate psychosis, because for such beliefs to be psychotic they would have to A) cause significant alarm or distress or B) significantly reduce a person's ability to function in one or more important areas of their lives. Religious beliefs typically cannot be characterised by either criterion. What is more, such beliefs would have to not be culturally sanctioned, and since religious beliefs almost always are, they cannot be considered psychotic.
It should be noted that oftentimes psychotic beliefs or halucinations do include religious elements. However, such elements are rarely consistent either with the beliefs of the person before psychosis, or with the beliefs of the religious community from with elements of the psychotic's delutions are borrowed.
In conclution, even if we restrict ourselves to an entirely physicalistic veiw of reality and assume that religion is obviously irrational, there is absolutely no reason to equate religion and religious belief with mental illness.




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