For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. (1 John 5:7)
The further evidence of God, Jesus and the Holy Spirit as one, is inscribed majestically at the beginning of Scripture.
Genesis 1:26 And God said, Let us make man in our image, after our likeness.
Note, the phrase and God said, the word God is in the singular form, meaning the single one of its kind. However, further in the verse, a new phrase is brought forth. which reads; Let us make man in our image. The word (us) is the objective case of we, denoting the person speaking and another, or others with him.
So then, God is one God (Deuteronomy 6:4), but who were with Him at the creation of man? Was God referring to the angelic host? Absolutely not, man was created in the image and likeness of God and not of the angels.
So God created man in His own image, in the image of God created he him; male and female created He them (Genesis 1:27).
Yet, the question still lingers, who were the parties that denotes, let us make man in our image? If we are truly searching the Scriptures, our questions are no longer a burden to bear, but the gateway to wisdom and the understanding of God. For we read in (1 John 5:7) there are three that bear record in heaven, the Father, the Word (meaning Jesus) and the Holy Ghost: and these three are one. So then can a person read the infallible Word of God, but yet denial the three as one God? Also known as the Trinity.
The repudiation against the Trinity, Father and Son and Holy Ghost in one. Is an indirect attack against Jesus Christ (the Word). An attack against Jesus Christ, is an attempt to keep man in darkness, away from the Light. Jesus Christ is that Light, for He said, I am the light of the world: he that followeth Me shall not walk in darkness, but shall have the light of life. (John 8:12).
Therefore, if Christ is not wholly seen as fully God and fully man, he who perceive Him partly, is seeing obscurely. Thereby their understanding of Him is limited and the fullness of His blessed wisdom is limited to those who acknowledge Him, yet denying the fact that He is God.
The necessity of the believer’s salvation, sanctification and glorification, is predicated upon Jesus being fully God, and fully man. Being fully man, He shall know our weakness, our failures and our needs. Being fully God, He is our strength when we are weak, our gracious God in times of failure. The provider of all our needs and the only forgiver of sin. So then, he who acknowledges Christ as just a man. Has limit the provision of God through Jesus Christ. For in him dwelleth all the fulness of the Godhead bodily (Colossians 2:9).
Whereas, If Christ is only seen as God, then salvation is not real, for it took the death of the man Jesus Christ for the remission of sin. Then there are who accept Him as the only begotten Son of God, but lower Him as lesser to God. If He is the Son of God who always existed With God and have no beginning, therefore His son-ship differ from the human biological procreation, whereas a human child carries the likeness of both parents. The child inherits half their DNA from each parent. But this we know, before Christ was born of the virgin, He existed in glory (John 17:5), therefore He have no beginning, neither was He created. So then, unlike a human child which carries in its body a representation of both parents. Christ as the Son of God has no mother, thereby Christ is 100 percent His Father, who is His Father? His Father is God. Hence, Jesus Christ is fully God. Yet, He took on the form of man, to redeem man from sin and pay the price of sin by His death on the Cross, but God cannot die. Therefore, He became man, a perfect man as the perfect Sacrifice to die in the place of sinful man. As He is fully God, He is fully man, if He is half man, then only half of our sins were paid for on the Cross. For we know He cleanse us from all unrighteousness (1 John 1:9). Being fully man, He had to become like us in order to save us. Yet, as the perfect man. In our imperfection, we received His perfection. Christ is our fully man and our fully God.
If He is half God, then we cannot be fully reconciled with God. For in him dwelleth all the fulness of the Godhead bodily (Colossians 2:9) Therefore let us not limit the blessing of God to us by limiting who Christ is and what He has done for us. Consequently, he who comes to Christ must accept Him wholly for Who He is, fully man and fully God. Lest your salvation is incomplete and your glorification is in doubt.
For further insight into the revelation of the nature of Christ, check out the birth of Christ.