....A possibility that insane people do see something we don't comprehend....
They do! Those are called hallucinations.....
Seriously though, I do see your point...and I believe you see mine (anything is possible).
The author's writing paints God in a very familiar fashion to himself. This is to say that God seems to fit nicely with how the author views the world. I suppose an argument could be made that God has crafted himself in this image, but the answers also seem to agree. So basically God seemed to fit nicely into his little view of the world and everything was cool. That the author continued to be an atheist afterward only says as much.
I believe that is something everyone should do. No two people are the same. Their brains function differently, they learn differently, they see things differently. No one description of God can fit into everyones world. A person's concept of god should grow and develop, just as their understanding of the world around them grows and develops. That is actually the primary problem I have with most organized religions. They offer little or no room for personal interpretation. It is either their way, or blasphemy.........(I'm sorry, but I just can't help it. I have to say...) it is possible the author still claims to be atheist because there is currently no religion that accurately describes his new found beliefs.
And as far as probability over possibility...consider that it was highly, HIGHLY improbable that the planet earth would happen to form just the right distance away from the sun to support life, but it did. It was even more improbable that life would ever form on earth, but it did. I even believe it would have been highly improbable for the human race to have been able to survive long enough to develop intelligence and rule the planet, but we did. (compaired to most of the animal kingdom we are slow, weak, squishy creatures with no natural defenses of any kind...the perfect prey.)
You should not completely dismiss any possibility simply because it is improbable. Our existence was only possible, because of a multitude of improbable occurrences. You should always plan for both, the probable and the possible. Hypothetically speaking, It is improbable that your kids will ever be struck by lightning, does that mean you will let them play outside during an electrical storm? Of course not, because the possibility still exists.