system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: If the Abrahamic God does exist, he is not necessarily perfect

To start with, I am an atheist but for the purpose of this I would like to assume that the Abrahamic God does exist, this shouldn't derail into a debate about the existence of God. 

The Abrahamic God is considered to be perfect. Everything the does is good because he cannot do wrong. But as people, how would we actually know this?

We know he created us. We know he is powerful and knowing. For what reason, other than just trusting what he says, do we have for believing that he is perfect? Within the bible he clearly shows human emotions, is it not possible he is extremely egotistical? If he is all there is, he has no one to question his authority, anyone with that status maybe go on to believe they are 'perfect'. There is no reason to assume he can't make mistakes, particularly when you look at the flaws in the world around us. 

It seems that Christians/Jews/Muslims not only take a leap of faith in his existence but also faith in that he actually is as perfect as he says because he is our creator.
gpt
TL;DR: The term "perfect" implies that there is some objective standard to which a thing is being held. If there is a singular being which creates literally everything else in existence, then that being is, by definition, the only standard to which the rest of existence can be held, because nothing else exists.

Though you only used the term "perfect" in your question, you seem to be meaning moral perfection specifically. In which case: on what grounds do you base your idea of morality? There are only a few options. 

One: there is an ultimate moral standard which is above God, against which someone could judge God's actions. This seems to be the view you're taking. But in the Abrahamic traditions, nothing exists other than God and what God creates, for lots of philosophical reasons that tie into why they believe God exists at all. 

Two: the ultimate moral standard is defined by God's actions - ie, whatever God does is morally good by definition. This is basically the view of the Abrahamic faiths. That is: our conception of "perfection" is based in the nature of God. We think compassion and love and justice are good because God is compassionate and loving and just. 

Three: there is no ultimate moral standard at all - in which case the whole conversation becomes nonsensical because neither perfection nor mistakes exist.

Your question implies that a standard of perfection exists - however you'd define it. The important question to ask is where that standard comes from. If God is the standard, he is perfect; if God is not the standard, you're no longer talking about the Abrahamic God. You cannot separate the *existence* of god or gods in any religion from the *nature* of the god or gods they believe in. Every religion is built on a particular understanding of what the universe is and how it functions - and that determines how they conceive of the Divine (including whether or not a personal God even exists - ie Hinduism or Buddhism, in which everything is part of the Divine). For the Abrahamic God to be the ultimate creator of literally all of existence necessarily means there is no standard of perfection beyond him with which he can be judged; he IS the only standard.