Just what do the biblical authors mean by "God" anyways? We all know that all gods are imaginary, right? So what makes the biblical god any different than, oh let's say the 330 million deities that populate the Hindu pantheon of gods?
Well for starters, the biblical authors distinguish their "God" from the rest by pointing out that if you're imagining anything about "God", you're not imagining God at all. You're just looking at the product of your own imagination. They even have a word for it. They call it idolatry.
An idol is any object that is viewed as a god itself. In other words, the biblical authors don't believe in objectifying "God" at all. They can imagine all sorts of gods just like the next guy, and they can admit that these gods are all imaginary. In fact, they would be the first to point out that they aren't gods at all. They're simply imaginary ideas. That's not what they mean by "God", and whatever meanings or definitions they do come up with aren't God either. They're just meanings and definitions for the word "God", which they will be the first to admit is simply a symbol for its meaning. Again, words and meanings are not gods; they're words with associated meanings.
Paul also points out that Christ isn't God when he refers to him as "the image of the invisible God"(Col.1:15). The word he uses for "image" is the Greek "eikon" which is where we get words like 'icon';"iconography"; "iconoclastic" etc. An icon should not be confused with an idol. As noted previously, an idol is worshipped as god, but an icon is a representation of God, and representations are not gods themselves.
Some would hasten to note that these two terms are synonymous, but this is only in relation to "things", and the biblical authors don't include God as any thing.
Given that the word "God" is essentially undefinable, unimaginable, and unknowable, thats what Jesus represents. He is an immanent representation of transcendence.
The biblical authors have a name for their "God" which they call "YHVH" which means "I will be", or "I will be what I will be", and what will be doesn't exist. Potentiality is not actuality.
They use words like "incomparable" or "there is none beside me". In other words, there is no referent for transcendence. There is no essential difference between the word "God" and nothing. There is no referent for God other than the word "God" itself.
The New Testament's gospel of John points out essentially the same thing. The introduction doesn't begin with "in the beginning was God". Why? Because God doesn't exist. He begins with "in the beginning was the word". That's all there is to begin with.
He then continues by pointing out that everything that exists is created(vs. 3), and at no time does he or anyone else ever suggest that God is created. Therefore, for those who are lacking even rudimentary reading comprehension skills, it logically follows that God doesn't exist. This is especially so given that the biblical authors view the objective world as the created world. So by definition, God can't objectively exist in the created world.
Paul reaffirms this in his letter to the Corinthians when he points out that God is the origin (not to be confused or conflated with "beginning") of all that exists while Christ is the means by which everything exists (1 Corinthians 8:6).
For those who insist in asking the question, "Who created God?, Paul's argument refutes that by pointing out that the origin of existence cannot logically exist without creating an infinite regression. So he has simultaneously admitted that God doesn't exist and denied the need for an infinte regression.