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I was merely thrown off when Dawkins started his preface with so much of an argument for evolution. I therefore thought he was directing it basically to those who don’t buy it. He isn't going to get anywhere with them anyway. So this, too, is what I mean in that he fails. He is preaching to the choir, really. He is really addressing evolutionists.

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He's addressing those that either don't know how complex our biological systems are, or those that think this complexity necessitates design.

Here is the preface (for those that want to reference it without downloading the entire PDF):

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This book is written in the conviction that our own existence once
presented the greatest of all mysteries, but that it is a mystery no
longer because it is solved. Darwin and Wallace solved it, though we
shall continue to add footnotes to their solution for a while yet. I wrote
the book because I was surprised that so many people seemed not only
unaware of the elegant and beautiful solution to this deepest of
problems but, incredibly, in many cases actually unaware that there
was a problem in the first place!
The problem is that of complex design. The computer on which I am
writing these words has an information storage capacity of about 64
kilobytes (one byte is used to hold each character of text). The
computer was consciously designed and deliberately manufactured.
The brain with which you are understanding my words is an array of
some ten million kiloneurones. Many of these billions of nerve cells
have each more than a thousand 'electric wires' connecting them to
other neurones. Moreover, at the molecular genetic level, every single
one of more than a trillion cells in the body contains about a thousand
times as much precisely-coded digital information as my entire
computer. The complexity of living organisms is matched by the
elegant efficiency of their apparent design. If anyone doesn't agree that
this amount of complex design cries out for an explanation, I give up.
No, on second thoughts I don't give up, because one of my aims in the
book is to convey something of the sheer wonder of biological
complexity to those whose eyes have not been opened to it. But having
built up the mystery, my other main aim is to remove it again by
explaining the solution.

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