Jesus is not a God in the sense of being a additional God. However, He is God in His unity with the Godhead. The Bible teaches that there are three persons of the Godhead: the Father, the Son, and the Holy Spirit. Their relationship is different from anything we experience in our world. They are each God, but they are not three separate Gods, only separate persons within the Godhead. There is only one God.
I know this sounds contradictory, but this is the case with many spiritual truths. We are told by Jesus that the only way to save our live is to lose it. Though this does not make sense logically, it is a great spiritual truth. 1 John 5:7
states, “For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.” The word, trinity, means three (tri-) in one (-unity).
Perhaps this will help. Although the Father, Son, and Spirit are three persons of the Godhead, they do not disagree or argue or ever work against one another. They are not separate in the way we are separate from other people. They are in perfect unity and are one in purpose and action. They are connected in ways that we can only begin to understand.
Now, the proofs of the deity of Jesus Christ are so many that I can only give a sampling here:
states, “In the beginning was the Word, and the Word was with God, and the Word was God.” The Word is clearly identified in John 1:14
as Jesus Christ. This verse clearly calls Him God.
1 Timothy 3:16
states, “And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.” Jesus was God manifest in the flesh.
states, “Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ.” Jesus is here called the “great God.”
says, “But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom.” Here, the Son (Jesus Christ) is addressed as God.
I hope this is enough to help you see who Jesus is. There is much more to prove this in the scriptures. However, I recognize that the trinity is a difficult subject for many. Perhaps it would be best just to understand that God is one, but within that unity is a trinity of persons, not separate Gods but separate persons within the Godhead of one God. It may not fit our logic, but God says that His ways are not our ways. Some things are revealed in the Bible that we cannot understand entirely, but we can still accept them by faith.