The Father, the Son, and the Holy Spirit
But to the Son he says, “Your throne, O God, endures forever and ever. You rule with a scepter of justice. You love justice and hate evil. Therefore, O God, your God has anointed you, pouring out the oil of joy on you more than on anyone else.” He also says to the Son, “In the beginning, Lord, you laid the foundation of the earth and made the heavens with your hands. (Heb 1:8-10, New Living Translation)

THE TESTIMONY OF GOD THE FATHER THAT HIS SON JESUS CHRIST IS GOD IS GREATER THAN THE TESTIMONY OF THE EVIL MEN THAT JESUS CHRIST IS NOT GOD:
If we receive the testimony of men, the testimony of God is greater. For this is the testimony of God, which is greater, because he hath testified of his Son.  He that believeth in the Son of God, hath the testimony of God in himself. He that believeth not the Son, maketh him a liar: because he believeth not in the testimony which God hath testified of his Son.  And this is the testimony, that God hath given to us eternal life. And this life is in his Son.  (1 Jn 5:9-11)
Note: Unless otherwise specified, all Bible quotes were taken from the Douay-Rheims Version.

THE FIRST TESTIMONY OF GOD THE FATHER THAT HIS ONLY BEGOTTEN SON JESUS CHRIST IS GOD:
And this is the testimony, that God hath given to us eternal life. And this life is in his Son.  (1 Jn 5:11)
The testimony of God is very clear: the eternal life that God has given us is in His Son Jesus Christ, who is the true God and life eternal:
And we know that the Son of God is come: and he hath given us understanding that we may know the true God, and may be in his true Son. This is the true God and life eternal.  (1 Jn 5:20)
Footnote on 1 John 5:20: And may be in his true Son: He is, or this is the true God, and life eternal. Which words are a clear proof of Christ’s divinity, and as such made use of by the ancient fathers.
In all the different versions of 1 John 5:20, it is very clear that the Son of God Jesus Christ is the true God and eternal life:
And we [have seen and] know [positively] that the Son of God has [actually] come to this world and has given us understanding and insight [progressively] to perceive (recognize) and come to know better and more clearly Him Who is true; and we are in Him Who is true—in His Son Jesus Christ (the Messiah). This [Man] is the true God and Life eternal.  (Amplified Bible)
And we know that the Son of God has come and has given us discernment, so that we may know who is genuine; moreover, we are united with the One who is genuine, united with his Son Yeshua the Messiah. He is the genuine God and eternal life.  (Complete Jewish Bible)
And we know that the Son of God has come, and has given us an understanding that we should know him that [is] true; and we are in him that [is] true, in his Son Jesus Christ. He is the true God and eternal life.  (Darby Translation)
But we know that that Son of God is come, and hath given us a mind to know him, which is true, and we are in him that is true, that is, in that his Son Jesus Christ, the same is that very God, and that eternal life.  (Geneva Bible)
We know that the Son of God has come and has given us understanding so that we know the real God. We are in the one who is real, his Son Jesus Christ. This Jesus Christ is the real God and eternal life.  (GOD’S WORD Translation)
We also know that the Son of God has come and has given us understanding so that we may know the true God. We are in union with the one who is true, his Son Jesus the Messiah, who is the true God and eternal life.  (International Standard Version)
And we know that Christ, God’s Son, has come to help us understand and find the true God. And now we are in God because we are in Jesus Christ his Son, who is the only true God; and he is eternal Life.  (The Living Bible)
We know that none of the God-begotten makes a practice of sin—fatal sin. The God-begotten are also the God-protected. The Evil One can’t lay a hand on them. We know that we are held firm by God; it’s only the people of the world who continue in the grip of the Evil One. And we know that the Son of God came so we could recognize and understand the truth of God—what a gift!—and we are living in the Truth itself, in God’s Son, Jesus Christ. This Jesus is both True God and Real Life. Dear children, be on guard against all clever facsimiles.  (1 Jn 5:18-21, The Message)
We know that the Son of God has come and has given us understanding so that we know the real God. We are in the one who is real, his Son Yeshua Christ. This Yeshua Christ is the real God and eternal life.  (Names of God Bible)
And we have known that the Son of God is come, and hath given us a mind, that we may know Him who is true, and we are in Him who is true, in His Son Jesus Christ; this one is the true God and the life age-during!  (Young’s Literal Translation)
And we know that The Son of God has come and he has given us a mind to know The True One and to be in The True One- in his Son, Yeshua The Messiah. This One is The True God and The Life Eternal.  (Aramaic Bible in Plain English)
For more of the English Translations of 1 John 5:20 please see here and here .

THE SECOND TESTIMONY OF GOD THE FATHER THAT HIS ONLY BEGOTTEN SON JESUS CHRIST IS GOD:
Another testimony of God the Father that His only begotten Son Jesus Christ is God is documented inHebrews 1:8:
But to the Son: Thy throne, O God, is for ever and ever: a sceptre of justice is the sceptre of thy kingdom.  (Heb 1:8)
For more of the English Translations of Hebrews 1:8 please see here and here .

THE THIRD TESTIMONY OF GOD THE FATHER THAT HIS ONLY BEGOTTEN SON JESUS CHRIST IS GOD:
Further testimony of God the Father that His only begotten Son Jesus Christ is God is found inHebrews 1:9:
Thou hast loved justice, and hated iniquity: therefore God (Son), thy God (Father), hath anointed thee with the oil of gladness above thy fellows.  (Heb 1:9, emphasis mine)
So as not to be blamed of quoting out of context, here is the complete Hebrews 1:1-10:
God (The Father), who, at sundry times and in divers manners, spoke in times past to the fathers by the prophets, last of all, In these days hath spoken to us by his Son, whom he hath appointed heir of all things, by whom also he made the world.  Who being the brightness of his glory, and the figure of his substance, and upholding all things by the word of his power, making purgation of sins, sitteth on the right hand of the majesty on high.  Being made so much better than the angels, as he hath inherited a more excellent name than they.  For to which of the angels hath he said at any time, Thou art my Son, today have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?  And again, when he bringeth in the first begotten into the world, he saith: And let all the angels of God adore him.  And to the angels indeed he saith: He that maketh his angels spirits, and his ministers a flame of fire.  But to the Son: Thy throne, O God (Son), is for ever and ever: a sceptre of justice is the sceptre of thy kingdom.  Thou hast loved justice, and hated iniquity: therefore God (Son), thy God (Father), hath anointed thee with the oil of gladness above thy fellows.  And: Thou in the beginning, O Lord (Son), didst found the earth: and the works of thy hands are the heavens.  (Heb 1:1-10, emphasis mine)
Here are more revealing renditions of Hebrews 1:6-10:
And again, when God brings his Firstborn into the world, he says, “Let all God’s angels worship him.”  Indeed, when speaking of angels, he says, “. . . who makes his angels winds and his servants fiery flames”; but to the Son, he says, “Your throne, O God, will last forever and ever; you rule your Kingdom with a scepter of equity; you have loved righteousness and hated wickedness.  Therefore, O God, your God has anointed you with the oil of joy in preference to your companions”; and, “In the beginning, Lord, you laid the foundations of the earth; heaven is the work of your hands.  (Heb 1:6-10, Complete Jewish Bible)
And when he brought his supreme Son into the world, God said, “Let all of God’s angels worship him.”  Regarding the angels, he says, “He sends his angels like the winds, his servants like flames of fire.”  But to the Son he says, “Your throne, O God, endures forever and ever.  You rule with a scepter of justice.  You love justice and hate evil.  Therefore, O God, your God has anointed you, pouring out the oil of joy on you more than on anyone else.”  He also says to the Son, “In the beginning, Lord, you laid the foundation of the earth and made the heavens with your hands.  (Heb 1:6-10, New Living Translation)
For more of the English Translations of Hebrews 1:9 please see here and here .

THE DILEMMA OF THE ENEMIES OF CHRIST:
Even if the Lord Jesus Christ will say “I am God,” His enemies will surely retort that his testimony is of no value because he is just a mere man to them, and they will cite 1 John 5:9 which states:
If we receive the testimony of men, the testimony of God is greater. For this is the testimony of God, which is greater, because he hath testified of his Son.  (1 Jn 5:9)
Now, here is their dilemma: If they run to the testimony of God regarding His Son Jesus Christ, they will be in for a shock because God testified that His Son Jesus Christ is truly God.
Thus, whichever way the enemies of Christ will turn to, the invincible truth that the Lord Jesus Christ is God is inescapable.

TO ALL THE UNBELIEVERS DEMANDING THE PERSONAL TESTIMONY OF JESUS CHRIST THAT HE IS GOD IN SPITE OF THE TESTIMONY OF GOD THE FATHER THAT HIS SON JESUS CHRIST IS TRULY GOD, HERE IS YOUR WAKE-UP CALL FROM GOD HIMSELF:
Seek ye the Lord, while he may be found: call upon him, while he is near.  Let the wicked forsake his way, and the unjust man his thoughts, and let him return to the Lord, and he will have mercy on him, and to our God: for he is bountiful to forgive.  For my thoughts are not your thoughts: nor your ways my ways, saith the Lord.  For as the heavens are exalted above the earth, so are my ways exalted above your ways, and my thoughts above your thoughts.  (Is 55:6-9)

THEREFORE, IF GOD SAID HIS ONLY BEGOTTEN SON JESUS CHRIST IS GOD, NEVER GIVE IT A SECOND THOUGHT BUT BELIEVE GOD AT ONCE LEST YOU MAKE HIM A LIAR:
Whoever believes in the Son of God has this testimony within himself.  Whoever does not believe God has made him a liar by not believing the testimony God has given about his Son.  (1 Jn 5:10, New American Bible)