This should be a very short debate:
- If Jesus was ‘WITH God’ how could he ‘BE GOD’?
- Who is ‘GOD’ that Jesus was ‘WITH’?
There are five versions of Jesus in the NT, one each from Paul, Mark, Matthew, Luke and John.
Each of those Jesuses expressly denies that he's God eg
(Paul) 1 Corinthians 8:6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
Mark 12:28 And one of the scribes [...] asked him, “Which commandment is the first of all?” 29 Jesus answered, “The first is, ‘Hear, O Israel: The Lord our God, the Lord is one; [...] 32 And the scribe said to him, “You are right, Teacher; you have truly said that he is one, and there is no other but he;
Matthew 20:23 “to sit at my right hand and at my left is not mine to grant, but it is for those for whom it has been prepared by my Father.”
Matthew 24:36 “But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only.”
Luke 18:19 “Why do you call me good? No one is good but God alone.”
John 17:3 “And this is eternal life, that they know thee the only true God, and Jesus Christ whom thou hast sent.”
John 20:17 “I am ascending to my Father and your Father, to my God and your God.”
and never claims to be God. It's sometimes claimed that John's Jesus (John 8:58) claims to be God with the words "Before Abraham was, I am." However, the Jesus of John, like the Jesus of Paul but unlike the synoptic Jesuses, is from the gnostic tradition and as such was an angelic style of being who not only lived in heaven with God from early on, but in the role of the gnostic demiurge created the material world ─
I Corinthians 8:6 yet for us there is one God, the Father, from whom are all things and for whom we exist,
and one Lord, Jesus Christ, through whom are all things and through whom we exist.
John 1:2 He was in the beginning with God; 3
all things were made through him, and without him was not anything made that was made.
Even so, the political problems of having the central character in Christianity not God led early on to versions of Jesus=God, but the Trinity doctrine didn't become official till the 4th century. Part of its attraction may be that it's incoherent, since it claims that the Father is not Jesus or the Ghost but is 100% of God, Jesus is not the Father or the Ghost but is 100% of God and the Ghost is not the Father or Jesus but is 100% of God. That of course adds up to 300% = 3 Gods. The incoherence arises because that obvious result is expressly denied.