How it is possible to be one God in three persons (Jesus, Holy Ghost, and God the Father)? 1)”Hear, O Israel: The Lord our God, the Lord is one. Deuteronomy 6:4
  
  2)And the Word( Jesus) became flesh and dwelt among us, and we have seen his glory, glory as of the only Son[a] from the Father, full of grace and truth.” John 1:14
  
  3)In the beginning was the Word, and the Word was with God, and the Word was God.” John 1:1
  
  4)He is the image of the invisible God, the firstborn of all creation. For by[a] him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him. And he is before all things, and in him all things hold together. Coossians 1:15-17
  
  5)”and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased.” Mathew 3:17


According to these 5 verses, it tells that Jesus was created before all the rest. And in another verse says that Jesus always existed. And in another verse, it says that Jesus is God. This where I can’t explain. How can Jesus, Holy Ghost and God be one God?

In first, I thought that Jesus and Holy Ghost are 2 different creators that are uncreated and God is the uncreated one which it will equal 3 gods.

CLARIFICATION

I had a conversation today with my religious teacher, and I asked him, “sir, can I ask you something?” And he said, “yes, you can” and I asked him, “is that true that Jesus is God’s creation?” And he said, “no, Jesus is God, in fact, he part from trinity of one God.” And I asked, “how can this be possible?” And he said, “I don’t know”. What I found that in Bible says that God has sent Jesus, what is that suppose to mean? Is Jesus another creator like God Himself? And in another verse I find this: 


  ”this is My beloved son! So listen to him”


Which it indicates that Jesus and God are different and not 3 in one God. But some rumors say opposite that Jesus, Holy Ghost and Father are three persons in one God.


  “I’ll be a Father to you, and you will be My sons and daughters, Says the Lord Almighty” [Corinthians, 6:18]


My questions are:


How it is possible to be 3 persons in one God?
Is there anything in Bible that clarifies the concept of trinity?


Can anyone please find something in Bible that can clearly explain how this is possible?
God is not a person.  God is a Being.
Within the One Being of God subsist the three persons of the Father, the Son, and the Holy Spirit.
Together, these three make up the One Being of God.
When Jesus was baptised in the River Jordan, all three were present: the Father whose voice was heard from heaven, the Son who was being baptised, and the Holy Spirit who appeared in the form of a dove.
That is why, when the Son died, the Father and the Holy Spirit did not also die.  The Being of God was not killed when the Son was killed because the Son is not the Father, the Father is not the Son, and the Holy Spirit is neither Father nor Son.
There has only ever been the One Being of God and there will only ever be the One Being of God.
Expressions such as &quot;person&quot;, &quot;Father&quot; and &quot;Son&quot; are used to help us grasp the concept of a complex creator God, although it must be noted that the pre-mortal Jesus was never created, but was active in creation, along with the Holy Spirit.
The best Bible verses to explain this are in John 1:1-5 and 14:

In the beginning was the Word, and the Word was with God, and the Word was God.  He was with God in the beginning.  Through him all things were made; without him nothing was made that has been made.  In him was life, and that life was the light of men.  The light shines in the darkness, but the darkness has not understood it...  The Word became flesh and made his dwelling among us.  We have seen his glory, the glory of the One and Only, who came from the Father, full of grace and truth.&quot;

Jesus is the Word.  Jesus came to earth to be born of a woman.  Jesus was God with us, back then. The Son laid down his life then took it up again and has returned to heaven, from whence he first came.
Edit: To Subsist, within the context of the Being of God, is To Exist, To Be.
Response to additional question: 2 Corinthians 6:18 must be read within the context of the previous verses about Christians not being yoked with unbelievers. They are being told to have nothing to do with pagans and idolatry.  Verse 18 is a quote from 2 Samuel 7:14 where God, through the prophet Samuel, makes promises to David regarding his kingdom.  God says “I will be his father and he shall be my son.  When he does wrong I shall punish him...  But my love will never be taken away from him as I took it away from Saul.”  David was not God’s literal son.  This is the explanation given in the NIV Study Bible notes:

This familial language expresses the special relationship God promises to maintain with David’s descendants... It marks him as the one God has chosen and enthroned to rule in his name as the official representative of God’s rule over his people. ”
The Christians in Corinth are being reminded of their special relationship with God.  Verse 16 explains: “I will live with them and walk among them, and I will be their God, and they will be my people.”
Romans 8:14 says that those who are led by the Spirit of God are sons of God.  In other words, all who have entered into the new covenant Christ Jesus established are adopted into God’s family.  It’s a spiritual relationship.   Ephesians 1:5 explains: “In love he predestined us to be adopted as his sons through Jesus Christ.”

There is only one Son of God, and that is Jesus, who brought with him his divine nature which was added to his human nature.  Those who belong to Christ are adopted into God’s family as sons and daughters, but not physically.  2 Corinthians 6:18 is about our spiritual relationship with God.