Quite, Howard. & two out of the three Webster's definitions cited above by Jack [& that is a US Dictionary] carry no overtone of mental disturbance: 1 & 2a are purely objective in their definitions and carry no adverse connotations; only 2b refers to a disturbed mental state.

I genuinely do think that Jack is overdefining the term 'delusion' as used by Dawkins. It is assertive, to be sure; but I do not think it carries any intentionally insulting tendency.

~M~