Is there any other God formed before Him and will be formed after Him?

Question: If there is only one God, and the only one God is the Father who is the Father of Christ and of His followers, and the God of Christ and His followers; is there any God formed before Him and will be formed after Him?

Answer: God Himself said that there was no God formed before Him, nor shall there be after Him.

10 “ You are My witnesses,” says the LORD,

“ And My servant whom I have chosen,
That you may know and believe Me,
And understand that I am He.
Before Me there was no God formed,
Nor shall there be after Me.

Isaiah 43:10, NKJV