Is Belief in God a Delusion?
The problem with the idea is that delusions in the pathological sense are typically fearful and often involve irrational beliefs. For example believing one has supernatural powers. For a working definition think "Scientologist" and "Tom Cruise". The definition of delusion in the article is:
Delusion: A false belief based on incorrect inference about external reality that is firmly held despite what almost everyone else believes and despite what constitutes incontrovertible and obvious proof or evidence to the contrary. The belief is not ordinarily accepted by other members of the person’s culture or subculture (i.e., it is not an article of religious faith).
My emphasis.
There is no incontrovertible evidence for or against the existence of God.
There is incontrovertible evidence that Dawkins is not a student of human perception and cognition so he is deluded when he rants about faith in god being a delusion. He has confused belief in God with religious belief. Freeman Dyson believed in God and he was regarded as the smartest man in the world. Many people from all walks of life believe in God but do not have religious beliefs.
One could argue that many economists suffer from the delusion that they are scientists. 🤣
If sustaining a belief impairs your daily functioning and disrupts your social relationships, then your belief is more likely to count as a delusion.
That is the critical issue about delusions. Religious belief reinforces social relationships within the group however religious belief can also break social relationship beyond the group. Belief in God, which is a separate question from religious belief, does not intrinsically disrupt social relationships and does not impair daily functioning.