Do you recall what he said about "delusion" since I do not have the book handy?
A persistent false belief held in the face of strong contradictory evidence.
My point with Crashfrog was that his contention of emulating persons around him (his reason for temporarily accepting God) is not the definition or cause of a delusion
If a delusion is as defined, then being taught false beliefs and subsequently holding to them in the face of strong contradictory evidence would render one delusional. So it can be cause of delusion, yes.
I could be wrong but let me speculate: Dawkins did not explain adequately what he meant by delusion; its definition, source and cause: my "delusion term is a red herring" stands.
You'd have to read the book yourself to decide if he did it adequately. I can only speculate you would find it inadequate where I find it adequate.
However, in Blind Watchmaker (1986) Dawkins says design is an illusion caused by natural selection. Did Dawkins say that natural selection or powers causes the delusion?
However, in Blind Watchmaker (1986) Dawkins says design is an illusion caused by natural selection. Did Dawkins say that natural selection or powers causes the delusion?
Essentially yes. Obviously by leading to humans who can be deluded, natural selection is a causative factor. And by creating an illusion of design, as well as tool making entities that look for utility natural selection has certainly created an environment where delusion would operate.