God -aka The LORD God the Father did come into his own creation and therefore into our time frame in days past ... as well as coming at specific time into the world as his ownWORD - known as our Lord Jesus.
It is so simple to understand! If you comprehend who is the LORD.
Succinctly:
There is only ONE invisible spiritual God.
Yet, He was able to create an image for his personal use.
He had it before he ever created mankind. (Gen.1:26,27 KJV)
In fact, IT was the firstborn of all creatures. (Colossians 1:15)
In the OT the ONE invisible God manifested his presence among men and angels with the use of THIS body of heaven - a super-natural IMAGE. (Exodus 3:6 KJV; Exodus 6:3 KJV; Exodus 24:9,10,11,12 KJV; Exodus 34:5,6,9 KJV)
The ONE invisible spiritual God, IN WHOM all things exist and OF WHOM all thing consist did appear as the image of the LORD God, who then became known as the God of Israel. The manifestation of the LORD God was the image of presence that preceded his only begotten Son... and thus The LORD God was The divine Father who worked among men and angels before his Son.
Isaiah 43:11 KJV tells us plainly this:
I, (the ONE invisible God), even I, am the LORD (the image of presence who appeared unto men and angels and became known as the God of Israel); besides ME (as the invisible one God and the one visible LORD) there is no savior.
Colossians 1:14,15 KJV tells us that our Lord who bled and died for the forgiveness of our sins was that very IMAGE belonging to God ... finally manifested in flesh.
John 1:18 KJV tells us that John the Baptist explained to men that it was the first time ever that anyone had ever seen God, the begotten Son.
Therefore, the ONE invisible God had entered the world yet again by the manifestation of his IMAGE of presence, but this time is was of the essence of flesh. God who had been known as the super-natural LORD God and Father of Israel was also able to become our fleshly Lord and Savior of the world ... Thus God the Father and God the Son.
God who has lived eternally ... who thought up time and events ... who created ways to measure it ... also knew how to enter into it! Time is IN THE CREATOR... and the CREATOR entered time - more than once and in more than one way!