Hear, O Israel: The Lord our God, the Lord is one.
- Dueteronomy 6:4 NIV
Philip said to Him, "Lord, show us the Father, and it is enough for us." Jesus said to him, "Have I been so long with you, and yet you have not come to know Me, Philip? He who has seen Me has seen the Father; how do you say, 'Show us the Father'?
- John 14:8, 9 NASB
This question might be asked as an obfuscation of the real issue of the Bible and Christ.
The provided answer is succinct and may help put a discussion back on track.
Who's to say God wasn't created by some yet higher God?
"Why assume so glibly that the God who presumably created the universe is still running it? It is certainly conceivable that He may have finished it and then turned it over to lesser gods to operate."
- H.L. Mencken
Upon being told that the universe was created by God, philosophy buffs might raise the question "And who created God?" It is postulated outside of Judeo-Christian circles that the God of the Bible could himself be a creation of a yet higher god, who is in turn the creation of a still higher god, on ad infinitum.
In response to this, the Bible proclaims God to be one and eternal. Additionally, it is this same God who the Bible reveals to be our creator and our judge. So even if a plethora of higher or lower creators somehow existed, it would not change the issue; namely Jesus' claim to be the physical manifestation of the one true God. The question of whether or not the God of the Bible was created by an even higher God is irrelevant.
When we are at work, we report to our immediate supervisor regardless of to whom they report. Similarly, we would be accountable to God, who is immediately above us, regardless of to whomever or whatever he reported - if he did. So no matter what is postulated about tiers of gods, the God we know about, the one who has made himself known to us, is the one that we need to respect.
The triune nature of God