No it's not a zero-sum game, but some goods are incompatible with others.
Why would an omnipotent deity be limited by human concepts of incompatibility?
For instance, God may decide to give one the good of entering into Heaven, now. And another the good of continuing to be alive.
Uh huh. You do realize that your claim here is categorically unfalsifiable?
Using your formulation, ANY outcome can be attributed to divine agency. If a devout young adult develops cancer, and her congregation sincerely prays for her recovery, either outcome is classified as the "will of God." If she survives, it's because the deity wanted her to survive, and intercessory prayer works! If she dies, it's because the deity wanted her dead (something that's evil when humans do it, but OK if the deity does it, no matter where the person's alleged soul ends up....). If she spends a lifetime suffering, it's because the deity wanted her to suffer (but that still doesn't prove that the deity is evil).
Allow me to demonstrate the problem of proposing unfalsifiable beliefs.
Let's hypothesize that there is a creator-deity which generated the entire universe. This deity does not actually care about the existence or life of any organisms, and on a whim creates a demiurge -- a less-powerful deity that is still capable of creating humans, populating them on a planet, and influencing natural events and diseases and even individual human choices. The demiurge is given a completely free hand over the Earth. How can we, as limited humans, ever know if any supernatural events we observe are attributable to creator-deity, instead of the demiurge? What if the demiurge represents itself as the supreme power on Earth? What if Moses was receiving instructions from the demiurge, instead of the creator-god? What if it lied when it convinced Christians that they would be judged in the afterlife -- and that there is no afterlife, no souls, no angels?
The demiurge theory is unfalsifiable. It is impossible to disprove, because I can simply attribute any proof you have, including subjective feelings of faith or supernatural events, to the deceptive demiurge.
Prayers can be assigned as the cause of God's choice since it is also a good to have one's will fulfilled, thus intercession through the virtuous act of prayer can be "grounds" for God granting one good as opposed to another.
Again, this doesn't make sense, and is unfalsifiable.
Surely you recognize cases where faithful and devout people make sincere intercessory prayers, asking nothing for their own benefit and hoping the deity will save an ill person -- and the person dies anyway. The prayer is virtuous, but is not rewarded. Why is that disqualified as proof that intercessory prayer does not actually work? Or that the supplicant's deity doesn't exist?
What if the recipient of the request is saved not by a divine intervention, but by a human who makes a free choice that winds up saving that person's life? Let's say I had a huge fight with my sister 10 years ago, and she develops a serious illness that requires a bone marrow transplant. In theory, I should have radical free will, and can choose to save her, or choose to let her take her chances finding another compatible donor, without any supernatural entity influencing my decisions.
If I make a free choice to donate the bone marrow, is that attributable to divine powers? Is the deity reaching into my brain, and making me perform this virtuous act? Do I still get ethical credit for it? Is it a problem if the deity makes me do it, yet people credit me personally as virtuous?
Also, you are not God, so the analogy fails.
And yet, the problem of theodicy remains.
If you posit that your deity is omnipotent, omniscient and the ultimate creator, those properties entail that the deity made a
deliberate choice to create pain, suffering and evil. There was no requirement for the deity to do so, because there is nothing to impose any such requirements on the deity. Nothing prevented the creator-deity from making a universe in which humans could experience happiness without feeling sadness, pleasure without feeling pain, or be ethical at all times.
Even in granting humans free will, the creator-deity would be setting the parameters of the actions available. The deity could have easily made "drown your child" as inconceivable to humans as "six-sided rectangles."
You can claim that the deity's choices and/or nature are inconceivable, and we cannot apply human standards to it. But if that's the case, then you
also lose the ability to describe the deity as benevolent, because that is
also an act of applying human standards. You cannot simultaneously declare your deity to be both indescribable by humans
and apply human standards to it. Invoking that argument is, at best, a Pyrrhic victory.