Any religion that claims multiple deities faces a logical impossibility. The existence of more than one maximally great being cannot logically occur, undermining polytheistic religions at their core.
The concept of God, by definition, includes being eternal and all-powerful. But what happens if we imagine more than one such being? A logical problem quickly arises.
If two maximally great beings existed, each would possess the power to act without limitation. Suppose one decided to eliminate the other. If it could not, then it is not truly all-powerful, and thus not God. If it could, then the defeated being is no longer eternal and thus also not truly God.
The very nature of maximal greatness—eternity and omnipotence—precludes the existence of multiple gods. The idea of “more than one God” collapses under the weight of its own definition: only one being can simultaneously embody true omnipotence and eternity.
True divinity has no rivals.