I didn't formulate this argument at all (I heard it presented by a co-host of the Reasonable Doubts podcast), but it appears to be solid. It looks like it's part of a similar vein of arguments revolving around the problem of omniscience and the problem of evil (see P3 and the justification for P2).
The problem of non-God objects asserts that if God is a maximally great being against which nothing could hope to compare, then God would never create any Non-God Objects.
This argument is aimed primarily at Anselmian conceptions of God or Perfect being Theology. Proponents of Perfect Being Theology typically assert that properties like knowledge, power, love etc. are properties contributing to greatness. So if a god exists and is a maximally great being, then it must have the maximum possible amount of these properties.
Consider the concept of "GodWorld," a possible world in which God never actually creates anything. If we presume that that God exists, we can assume that GodWorld could exist, since the act of creating the universe (or any non-God object) was a choice that was not borne of necessity.
Proposition P1: If the Christian God exists, then GodWorld is the unique best possible world.
Proposition P2: If GodWorld is the unique best possible world, then the Christian God would maintain GodWorld.
Proposition P3: GodWorld is false because the Universe (or any non-God object) exists.
Conclusion: Therefore, the Christian God, as so defined, does not exist.
Thoughts? Critiques? Here are the justifications for the premises.
Justifying P1
If God exists, he is an ontologically perfect being - meaning he has those great-making properties to their maximal compossible degrees and no such properties to any lesser degree. A world comprised of only the maximally-great being for eternity would be a world comprised of all those great-making properties to their maximal compossible degrees and no such properties to any lesser degree. Unless there is some source of unique Goodness - Goodness that exists outside of and fully independent of God, GodWorld must be the unique best possible world. GodWorld eternally sustains the highest overall ontological purity and, therefore, overall ontological quality to which no other world can compare, therefore it is the unique best possible world.
Justifying P2
An omniscient being would be aware of the fact that himself existing alone for eternity as GodWorld is the unique best possible world that could ever exist, and because God is essentially morally perfect, he couldn’t have a motivating reason to intentionally alter the overall maximal purity and, therefore, the quality of the unique best possible world - because any alteration in overall purity by the introduction of a universe or any Non-God object, would, by necessity, be a degradation of overall purity and, therefore, overall quality. God wouldn’t introduce limited entities each with their own unimpressive set of degraded great-making properties like the creation myth of Genesis records. While Adam and Eve clearly do have great-making properties (knowledge, power), they have them to an unimpressive degree and so introducing such beings would result in a degradation of overall ontological purity and, therefore, a degradation of overall ontological quality. To suggest God is in the degrading business is to suggest he wasn’t maximally great in the first place.
Justifying P3
P3 is the easiest of the three to justify. It can be justified merely by a simple recognition that you, yourself, are not God.
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