I believe while it is not explicit, the most critical reason 'Why must God be the Perfect Being?' is this;Why must God be the Perfect Being?
Matthew Barrett · March 11, 2019
https://credomag.com/2019/03/why-must-g ... ect-being/
Why must God be the perfect being?
Is God is someone than whom none greater can be conceived?
How does God’s perfection set the trajectory for all other attributes in God?
How does God’s perfection necessitate his infinitude?
In this new Credo video, Matthew Barrett discusses what perfect-making attributes must follow if Anselm is right that God is someone than whom none greater can be conceived.
Watch other videos like this one on the Credo Video page.
And if you enjoyed this video, check out Matthew Barrett’s new book, None Greater: The Undomesticated Attributes of God (Baker).
For too long, Christians have domesticated God, bringing him down to our level, as if he is a God who can be tamed.
But he is a God who is high and lifted up, the Creator rather than the creature, someone than which none greater can be conceived.
If God is the most perfect, supreme being, infinite and incomprehensible, then certain perfect-making attributes must be true of him.
Perfections like aseity, simplicity, immutability, and eternity shield God from being crippled by creaturely limitations.
At the same time, this all-powerful, all-knowing, and all-wise God exhibits perfect wisdom, holiness, and love as he makes known who he is and how he will save us.
When we need to be reminded of God’s magnificence, the attributes of God show us exactly why God is worthy of worship: there is none like him.
Join Matthew Barrett as he rediscovers these divine perfections and finds himself surprised by the God he thought he knew.
".. how he will save us"
save theists from what?
The fact is theists want to be saved from the terrible exuding subliminal pains due to cognitive dissonances driven by an inherent existential crisis in ALL humans.
To be 'certainly' assured they will be saved against all other threats and odds, their God must be absolutely perfect, i.e. a God that no greater perfection can be conceived.
This is the reason why the God of the major religions, i.e. Christianity and Islam [comprising appx 5 billion theists] must be absolutely perfect. This is state of perfection is stated in their holy texts, Gospels [only not OT] for Christians and Quran for Islam..
Any erosion of perfection from absolute perfection will erode their confidence that they will be saved with eternal life in heaven and paradise.
ETA:
If God is not claimed to be absolutely perfect, then, such an imperfect God is subject to the following;
- 1. Such a God could be a 1 million times more intelligent Matrix God that is creating our current reality, and we are merely sort of brain-in-a-wat or a puppet-on-a-string programmed and controlled by that imperfect Matrix God.
2. An imperfect Matrix God is subject to infinite regression, i.e. who created God and so on.
3. An imperfect is subjected to be ridiculed by other theists who claim their God is of absolute perfection no greater can be conceived.