First, by definition God is eternal and therefore uncreated. This is not unlike asking something like this, When did a rectangle start to have 4 sides?
Second, the answer is already determined by the presuppositions. If you can only think from within the box of causality everything must have a cause, then you are stuck with “infinite regression”. The irony of this is that “infinite regression” is just another way of expressing the eternal.
GOD always has been, GOD always is, GOD always will be. ALMIGHTY GOD is ETERNAL
(Exodus 3:13-14)" And Moses said unto GOD, Behold, when I come unto the children of Israel, and shall say unto them, The GOD of your fathers hath sent me unto you; and they shall say to me, What is his name? what shall I say unto them? And GOD said unto Moses, I AM THAT I Am, and He said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you."
(Psalm 90:1)" LORD, Thou hast been our dwelling place in all generations."
(Psalm 90:2)"Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting thou art God."
(Psalm 90:4)"For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.
(Isaiah 44:6)" Thus saith the LORD the King of Israel, and his redeemer the lord the LORD of Hosts, I AM the First, and I AM the Last; and beside me, there is no God."
(Isaiah 44:7) "And who, as I, shall call, and shall declare it, and set in order for me, since appointed the ancient people? and the things that are coming, and shall come, let them shew unto them."
Glory be to Almighty God, The Most High God. Please share this information to others telling them that God was there before the beginning of time, He now and He will be there always.
God bless you all for believing and accepting the gospel of the cross!