There is ONE invisible eternal infinite omni-present all-powerful Spiritual God ... but remember HE was/is a Creator. IOW, he creates things! Where are these things? Ans. WITHIN HIM. He is the source of all things and encompasses all things. Now, the first of all creatures HE created was an IMAGE for himself! A whole book could be written on this revelation but I won't. I will merely add my input within a few passages.
KJV Colossians 1:15 -17 [Jesus], who is the image of the invisible God, the first born of every creature 16 For by him were all things created,that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: ALL THINGS were created by him, and for him: 17 And he is before all things, and by him all things consist.
Think about it this way: John 1:1... Jesus was the WORD who was with God and was God; therefore, Jesus was NOT CREATED. He eternally existed as God being HIS WORD. So what was created in the verse above? I'll place the appositive right after the noun it describes. Watch.
[Jesus]who is [seen as] the IMAGE, THE FIRST BORN OF EVERY CREATURE, of the invisible God... 17 By him [Jesus who was the WORD of God who was God and who was seen by men bearing the likeness of the image created for GOD'S purposes] ALL THINGS were created by him and for him. 17 And he [being God] is before all things, and by him all things consist.
ONE invisible God correctly created ONE visible IMAGE to represent the truth about his being the only God. He also created IT to use for his purposes of being seen within the realms he created with sentient creatures. God's visible presence became known as LORD God the Father/YHWH.
Now, so far we recognize ONE God as two personages. 1.) the infinite ONE Spiritual invisible God
2.) God the Father/YHWH whom Abraham, Isaac, and Jacob knew only as God Almighty. His name YHWH was only revealed much later to Moses who inserted it into his writings.
According to Genesis 2, this glorious presence of YHWH/LORD was shared by all of God including HIS WORD. It is said: Let US make man after the likeness of OUR [one] image! The WORD was there as God and as one who was with God; so there is a hidden third person represented by the image of the Father. One might say: the Father and the WORD shared the GLORIOUS presence from the beginning while appearing as the ONE GOD. According to this insight within the Old Testament one might say : When you have seen the Father, you have seen the Son. Or then again in the New Testament Jesus might say: When you have seen me, Jesus the begotten Son, you have seen the Father.
You see they SHARED THE GLORY of the created presence belonging to the ONE God from the beginning of all things. The THREE in one. Jesus requested that he receive back the same GLORY he once had with/shared with the Father from the beginning!
Now, this next verse should finish the concept of three personages and who was Jesus:
John 1:18 KJV paraphrased by me in order to reveal three insights:
1.) placing the appositive next to the noun it describes
2.) putting the adverbial prepositional phrase in front of the verb it modifies
3.) Identifying the antecedents for the pronouns he and him
No man at any time hath seen GOD, THE BEGOTTEN SON, who is [by this time] in the bosom of the Father, he [John the Baptist who made straight the way for the Messiah] has declared HIM [to us as being God the promised Son/Messiah].
Last comments: This verse does not say no one had seen the glory of God the Father; it tells us that it was the first time anyone had seen God as the Son begotten in flesh.
This makes personage number three and all were/are the ONE God. They are HE. HE is They.