Man, you should have Googled before you open your mouth. That scale is referenced on every page.
I finally found my copy of the book - I had misplaced it some time ago and finally made a correct guess as to its location.
So, forgive me on that minor error - I discovered the book the year it was released, and hadn't picked it up since (nor had I even approached competition of the text).
I had saved my place, but had apparently jumped ahead and read random pages here and there... as I had discovered some material looked familiar when flipping through the book just a moment ago.
Pages 50-51 demonstrate that list for the first time (and I did not see many pages where this scale is even remotely mentioned, but that was a quick run-through so I'll give you the benefit of the doubt there).
Page 51 is a line I remember reading quite clearly:
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"I'd be surprised to meet many people in category 7, but I include it for symmetry with category 1, which is well populated. It is in the nature of faith that one is capable, like Jung, of holding a belief with adequate reason to do so (Jung also believed that particular books on his shelf spontaneously exploded with a loud bang). Atheists do not have faith; and reason alone could not propel one to total conviction that anything definitely does not exist. Hence category 7 is in practice rather emptier than its opposite number, category 1, which has many devoted inhabitants.
I count myself in category 6, but leaning towards 7 - I am agnostic only to the extent that I am agnostic about fairies at the bottom of the garden."
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As he made clear with, well, the majority of the book, leaning towards category 7 and actually being in category 7 are two different things. He argues constantly against the existence of any gods, using imho solid logic and reason. He never once makes a statement that ever appears to say "I know, 100%, that no god(s) exist."
The book firmly supports the notion that his conclusion no god(s) exist is a logical and reasonable deduction.