Is there a great moral precept somewhere saying that it's
against the rules for any decent "God" to care what humans believe? engraved on gold tablets? handed down "from on high"?
That makes no sense whatsoever.
If you have a "fear of being on the wrong side of the argument," doesn't that mean you think the other "side of the argument" might really be the truth? Why would you fear being "on the wrong side" unless this means you believe the other side might be the "right side" of the argument? meaning it might be the truth? meaning you believe it (fear that it's the truth), though with doubt?
Believing doesn't have to mean there's no doubt (or no fear of being wrong).
"Faking your belief out of fear of being on the wrong side of the argument" means you fear that this belief you're faking might actually be a true belief, and to hedge your bets, you "pretend" to have this belief because it might be the truth. I.e., you half-way do believe it already, as a possibility. And this doubting belief causes you to claim to believe it, in order to safeguard against being on the wrong side.
Why would the "omnipotent being" reject this kind of belief? You can call it "faking," but it's really based on a genuine belief (fear) of what might be the truth, or what you think (fear) might be the truth.
There is no reason why Christ-belief cannot be partly a belief from fear that it might be the truth. Belief can include doubting and hoping and fearing. It can include wanting it to be true, but also fearing that it might be true. There is no reason to condemn any kind of believing, calling it "fake" or whatever.
If one is trying to believe, no matter what drives it, there is nothing ungenuine about it, or phony. In the accounts of those healed by Jesus, in the Gospels, there is nothing to suggest that the "faith" of these ones healed was a very superior kind of faith which had to measure up to some high standard of loftiness.
(In any case, I have one more pretty jewel than you, so I must be right.)