The Meanings of Delusion

An atheist is actually a religious person
who doesn't believe in religion; a fool,
who explains and attack that thing
that he doesn't believe exists.

A delusion is a belief held with strong conviction despite superior evidence to the contrary.^[1] As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, or other effects of perception.

Delusions typically occur in the context of neurological or mental illness, although they are not tied to any particular disease and have been found to occur in the context of many pathological states (both physical and mental). However, they are of particular diagnostic importance in psychotic disorders including schizophrenia, paraphrenia, manic episodes of bipolar disorder, and psychotic depression. -http://en.wikipedia.org/wiki/Delusion

delusion, in psychology, a rigid system of beliefs with which a person is preoccupied and to which the person firmly holds, despite the logical absurdity of the beliefs and a lack of supporting evidence. Delusions are symptomatic of such mental disorders as paranoia, schizophrenia, and major depression and of such physiological conditions as senile psychosis and delirium. They vary in intensity, extent, and coherence and may represent pathological exaggeration of normal tendencies to rationalization, wishful thinking, and the like. Among the most common are delusions of persecution and grandeur; others include delusions of bodily functioning, guilt, love, and control. -http://www.britannica.com/EBchecked/topic/156888/delusion


a belief that is not true : a false idea

: a false idea or belief that is caused by mental illness

1:  the act of deluding :  the state of being deluded

2 a :  something that is falsely or delusively believed or propagated

b :  a persistent false psychotic belief regarding the self or persons or objects outside the self that is maintained despite indisputable evidence to the contrary; also :  the abnormal state marked by such beliefs. -http://www.merriam-webster.com/dictionary/delusion