To be deluded there has to be evidence to the contrary, no?
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M*W: In this case, the evidence you are referring to would be atheism or contradiction to religious delusion.
From Wikipedia:
"A grandiose delusion is an experience of an extremely exaggerated sense of worth, power, knowledge, identity, or relationship. Someone who is grandiose may believe he can speak to supernatural beings or that he is a supernatural being himself. This is one of three of the strong signs that help determine whether a person is psychopathic, along with superficial charm and egocentriscm."
From about.com:
"Nonbelievers may often think that religious believers are deluded, but could it be that there really is a close connection between psychiatric delusions and religious beliefs? It is true that people with identifiably mental illnesses can experience, as one of the symptoms 'hyper-religiosity,' so perhaps the line between the two is not as sharp as people normally assume."
See:
Spiritual Truth and Religious Delusions, by H. Lawrence Zillmer, Lightning Source Inc., 2006, ISBN1413494846
OTOH, in order for there to be religious delusion, there has to be unrefutable evidence for religious belief. Unfortunately, there is no proof that belief in religious phenomena and ancient mythologies are true. Therefore, all religions are man-made delusions.
See:
The God Delusion, by Richard Dawkins, Professor, Public Understanding of Science, Oxford University, 2006. ISBN 0-618-68000-4
"In the book, Dawkins argues that religious faith qualifies as a delusion, which he defines as a persistent false belief held in the face of strong contradictory evidence. He is sympathetic to Robert Pirsig's observation that "when one person suffers from a delusion it is called insanity. When many people suffer from a delusion it is called Religion."
See:
Gale Encyclopedia of Mental Disorders, by Jennifer Hahn PhD, The Gale Group Inc., Gale, Detroit, 2003
"Religious delusion: Any delusion with a religious or spiritual content. These may be combined with other delusions, such as grandiose delusions (the belief that the affected person was chosen by God, for example), delusions of control, or delusions of guilt."
From KSL News Radio 1160 AM:
"The National Alliance for the Mentally Ill's Vicki Cottrell says religious delusions are common among people with an
existing mental illness. 'We know it exists, but it's a very complicated answer. With mental illness, with bipolar disorder, with depression, with schizophrenia, you can have
religious delusions.'"
"Cottrell says experts still don't know a lot about how religion plays into mental illness, and there's still debate over whether or not it can be treated."