"No it doesn't. Even Richard Dawkins says he is not certain that God doesn't exist. The delusion refers to the whole world of belief, with all its ceremony and trappings and elaborate "theology", that revolves around a being whose probability of existence is vanishingly small as measured on any rational scale."

As far as I am aware, all Dawkins is saying, is that the scientific probability of Gods existence, based on the knowledge we currently have about the observable universe, is very low.

It follows that there remains a scientific possibility that he does exist.

So when he says that "he is not certain that God doesn't exist", he is merely reflecting the existence of that very small probability.

Beyond that, I don't think that Dawkins intends to invest any belief of his own.

He does of course, observably and understandably, invest faith and belief in the reliability and soundness of scientific methodology, but I have no way of knowing if he would admit to that. I suspect he would probably plead dispassionate objectivity as if he were some kind of vessel of scientific thinking and not a subjective human being.