somehow can only be correctly perceived as being one (as opposed to any other number, including none)?
Well logic tells us it cannot be
more than one, at the very least.
Well first and most important to note: monotheists and polytheists typically have differing definitions of what the word "god" should mean. Most disagreement seems to boil down to those differing definitions.
But if we use the typical monotheist definition of what constitutes a god, because we are talking about the reasonability of monotheism, we can see that polytheism, or multiple gods using the monotheist definition of what a "god" is, is
completely impossible.
This is because inherent in the definition of a "god" to a typical monotheist, a god is all-powerful by nature. A divine being with less than all-powerful power
may exist, in the monotheist framework, but it does not fit the monotheist's definition of a "god" because it is not all-powerful (see: angels, saints, demigods).
Now imagine we have two All-Powerful Gods: God A and God B. God A wishes to do something simple, that
any all-powerful being should be able to do. God A wishes to move a rock from point A from point B. God B similarly wants to do something that should be simple for an all-powerful being to do: God B wishes to prevent the same rock from being moved.
So does the rock move, or does it not?? If the rock moves, then God A is all-powerful, but God B is
not. If the rock does not move, God B is all-powerful but God A is
not. In both situations there is something a god
cannot do, and one god is shown to be more powerful. When two all-powerful beings have differing desires: one wants something to happen, one does not want something to happen, then, logically, a thing cannot both happen and not happen, so one being will be proven to be more powerful than the other.
So there
cannot be two all-powerful beings, for if two beings that can each "do anything", and each want to do something that the other one wishes to contradict, then one being cannot logically be said to be able to "do anything".
I'm sure someone might be tempted to be a Devil's advocate to this above thought experiment and logic by stating there might be two all-powerful gods, which never contradict one another.
However if the gods cannot contradict one another, they cannot be said to be all powerful. And if the gods are all of one mind, then one could say there is just one god, with many bodies.
So, using the
monotheist definition of a "god", there are only two possible numbers for the question "How many gods are there??" It either must be One or it must be Zero. Any more than one "all-powerful" being cannot, logically, exist. One or Zero. No other number of all-powerful beings is possible.
It seems to me that there is a core mistake in attempting to have a rigid, well-defined conception of deity and then building a doctrine that relies on the accuracy of that conception.
For one thing, that is not very useful. Human beings are simply not likely to hold very similar conceptions of deity - or as I personally prefer to call it, of the sacred - and insisting that we nevertheless should act as if we did will only lead to pointless anxiety, fear, even moral dishonesty or at least the temptation to fall into it.
I fail to see what the problem of different people holding different conceptions of a being is. Certainly, a Republican, a Democrat, and a Libertarian all have different conceptions of Donald Trump, but the diversity in conceptions of Trump does not change the fact that there does exist an objectively real Donald Trump who is independent of those conceptions.
And that leads to a far greater problem than simple inaccuracy of doctrine. Insistence on the claim of universal truth and significance of such a minor and deeply personal matter as conceptions of deity compromises the very worth of any doctrine. All too quickly it becomes too busy in defending itself from the fragility of its own premises and the unavoidable consequences, and the validity of the teachings of even its most skilled, best meaning adherents is put to waste.
There can be no truly accurate doctrine. A vessel cannot contain a quantity greater than itself. Thus, a finite mind cannot comprehend an infinite being, nor can a database store every single fact about the universe itself because no database could be big enough to store all that data (something that the people who like to posit the question "What if the world is just a simulation??" often overlook).
I don't see how the fact that absolute knowledge of things is impossible is a problem, though. It's a limitation, but man can still obtain knowledge in degrees, knowledge progressing towards the truth, even if the absolute truth is
forever out of reach.
We all should be at peace with the simple contemplation that it is not for humans to act as wardens of specific, rigid, limited understandings of the sacred. Such an effort is both arrogant and demeaning, regardless of whatever some speculative truth about the nature of the sacred might be.
Surely, if even reasonably average human beings can easily be skilled enough to have various aspects according to the people that they interact with and the situations that they find themselves in, then there should be no doubt that a true deity (if such exists) can hardly be limited in its manifestations in ways that would be unreasonable even to humans?
Okay, sure. I definitely agree that such a being, if exists, is beyond total comprehension, eschews rigid definition, and is not limited in manifestation, but that does not change the fact that basic logic caps the potential number of all-powerful entities at
one.