Who created God?

Numerous Bible passages testify that the Godhead (i.e., Father, Son, Spirit) is eternal and without beginning and existed before all created things:

Rom. 16:26 but now is manifested, and by the Scriptures of the prophets, according to the commandment of the eternal God, has been made known to all the nations, leading to obedience of faith;

Notice He is called the “eternal” God. The word eternal in Greek means “age-long" or forever. God was never not in existence. Furthermore, God is the Creator of all things, so He existed before all things in Creation:

Gen. 1:1 In the beginning God created the heavens and the earth.

Is. 41:4 “Who has performed and accomplished it, Calling forth the generations from the beginning? ‘I, the Lord, am the first, and with the last. I am He.’” 

Is. 44:6  “Thus says the Lord, the King of Israel and his Redeemer, the Lord of hosts: ‘I am the first and I am the last, And there is no God besides Me. 
Is. 44:7  ‘Who is like Me? Let him proclaim and declare it; Yes, let him recount it to Me in order, From the time that I established the ancient nation. And let them declare to them the things that are coming And the events that are going to take place. 

Is. 48:1 “Listen to Me, O Jacob, even Israel whom I called; I am He, I am the first, I am also the last. 
Is. 48:13 “Surely My hand founded the earth, And My right hand spread out the heavens; When I call to them, they stand together. 

Mic. 5:2 “But as for you, Bethlehem Ephrathah, Too little to be among the clans of Judah, From you One will go forth for Me to be ruler in Israel. His goings forth are from long ago, 
From the days of eternity.” 

John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 
John 1:2 He was in the beginning with God. 
John 1:3 All things came into being through Him, and apart from Him nothing came into being that has come into being. 

The beginning of Creation, God and His Son (i.e., the Word) were already in existence.

John 8:56 “Your father Abraham rejoiced to see My day, and he saw it and was glad.”
John 8:57 So the Jews said to Him, “You are not yet fifty years old, and have You seen Abraham?” 
John 8:58 Jesus said to them, “Truly, truly, I say to you, before Abraham was born, I am.”

John 17:5 “Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was.

Col. 1:15  He is the image of the invisible God, the firstborn of all creation. 
Col. 1:16 For by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities — all things have been created through Him and for Him. 
Col. 1:17 He is before all things, and in Him all things hold together. 

Heb. 7:3 Without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God, he remains a priest perpetually. 

Rev. 1:8  “I am the Alpha and the Omega,” says the Lord God, “who is and who was and who is to come, the Almighty.”

Rev. 21:6 Then He said to me, “It is done. I am the Alpha and the Omega, the beginning and the end. I will give to the one who thirsts from the spring of the water of life without cost. 

Rev. 22:12  “Behold, I am coming quickly, and My reward is with Me, to render to every man according to what he has done.
Rev. 22:13 “I am the Alpha and the Omega, the first and the last, the beginning and the end.”

The first letter in the Greek alphabet is alpha and the last letter is omega. Therefore, the Lord is saying symbolically that He was before everything else and He is after everything else. Again, He was never not in existence.