For the sake of discussion, we are assuming some form of theism is true.
We can determine which of two things is more fundamental by seeing if one can be derived from the other without the reverse being true.
P1) X can be derived from Y.
P2) Y cannot be derived from X.
C) Y seems more fundamental than X.
When we look at monocentric and polycentric manifolds, we can see that polycentric manifolds are fundamental.
We can see this by thinking about a tree of life pattern of circles over an infinite plane. Not only does every circle have its own center, but every center is also the center of the entire pattern. This is similar to how every center of the observable universe (regardless of where the observation takes place) is also able to be considered the center of the universe, or how the universe expands from every single point equally.
This pattern is polycentric in nature, but yet each circle of the pattern can act as the basis of a monocentric system.
As such, if you have a polycentric manifold, you can derive a monocentric manifold from it.
However, the reverse is not true. No matter the nature of a monocentric manifold, you cannot derive a polycentric manifold from it.
So, replacing X and Y, we get:
P1) Monocentric Manifolds can be derived from Polycentric Manifolds.
P2) Polycentric Manifolds cannot be derived from Monocentric Manifolds.
C) Polycentric Manifolds seem more fundamental than Monocentric Manifolds.
Now, since we also know that Polycentric Manifolds actually exist, we can then take this a step further:
P3) Polycentric Manifolds exist.
C2) Polycentric Manifolds are fundamental.
C3) Monocentric Manifolds are not fundamental.
This is because if Polycentric Manifolds are something we could conceive are possibly more fundamental but do not actually exist, then it would be hard to say they actually are more fundamental.
Now, to relate this to theism, monotheism is a type of Monocentric Manifold, polytheism is a type of Polycentric Manifold. Thus, we can also add this to the argument,
P4) Monotheism is Monocentric and polytheism is Polycentric.
C4) Therefore, polytheism is true (derived from C2, C3, and P4).
Altogether, we have:
A) Some form of theism is true.
P1) Monocentric Manifolds can be derived from Polycentric Manifolds.
P2) Polycentric Manifolds cannot be derived from Monocentric Manifolds.
C) Polycentric Manifolds seems more fundamental than Monocentric Manifolds.
P3) Polycentric Manifolds exist.
C2) Polycentric Manifolds are fundamental.
C3) Monocentric Manifolds are not fundamental.
P4) Monotheism is Monocentric and polytheism is Polycentric.
C4) Therefore, polytheism is true.
Credit:
Argument is ultimately derived from Edward Butler's argument on the topic, with some help from Willdam to formulate the argument.