Is atheism a belief?

[The Grand Nudger]

 And anyway, we're not talking about panpsychism, we're talking about god

Not really the point. I'm not really talking about God, the definition of God, or about the nature of the Universe.

IF panpsychism, then god, IF NOT panpsychism, then not god.

Quantum cats and potential ambiguity don't matter if any of the above statements are true, and they can't all be true simultaneously.  Again, if you have some valid reason for your agnosticism...and I'm perfectly willing to believe that you do (especially since the bar for a valid reason for agnosticism is "I just don't know", lol..?), the panpsychism angle isn't among them.

If it were the only thing to judge your agnosticism by, the only thing you could explain it by, a person would be forced to conclude that you were engaged in a faulty ad hoc rationalization for the specifics of some state of belief or knowledge whose underlying cause or justification you were unaware of.

If someone asks you "do you believe x" and you respond with "I don't know" you have answered the question "what month is it" with "tuesday"...or, you've simply indicated that you don't know the contents of your own beliefs.

If you don't know, and you have no beliefs either way, then the answer to the question "do you believe the cat is alive" is "no" - simply no. It's also the answer to the question "do you believe the cat is dead". It's an interesting predicament to be in, but only from a semantic point of view. You're an agnostic because you don't know whether the cat is alive or dead. You're an aquantumcatist because you don't believe either claim. I do think that this is a better example, but it only shows us a greater level of specificity into the two terms referents and how they can play out in novel ways. Ala

""Yes or no! Do you have that belief or don't you?" - No, you don't. You've given reasons as to why you -don't- hold such a belief and why it would be imprudent to do so, so far as you can see.