This is distressing in that something so clear that even atheist scholars have agreed to existing is causing issue.
The issue is is that the OP (and some others here) doesn't actually understand the controversy in regards to the Trinity. The Trinity existing is very easy to see and prove in the Christian Bible. At least that God has at least two persons: the Father and the Son. I've already proved it. The Johannine works being included at all already supports this.
The issue with the Trinity is that it has attributes that appear contradictory to one another, not that it exists in the first place. Most (logical) descriptions are considered heresies.
That just showing fact that he exist before became a human.
No, you're missing the point because you're not looking at the entire gospel.
John 5:17-18: 17 But Jesus answered them, “My Father is still working, and I also am working.” For this reason the Jews were seeking all the more to kill him, because he was not only breaking the sabbath,
but was also calling God his own Father, thereby making himself equal to God.
To show he existed before Abraham? So why doesn't he say "I was"? "Before Abraham, I was [there before him]"? There is zero debate that John has a high Christology, whether it be from religious scholars who are religious or atheist. In the opening lines (as I have shown), he tells you that Jesus is God, so when you read and Jesus says "I am" (rather than "I was" when referring to himself being before Abraham), it's supposed to be an obvious reference to Exodus where God announces His name.
You are right if we look at that sentence alone, but you're not supposed to read that sentence alone. It has context. That's what you're not getting. You can't just pick a line and not look at its context.
There is difference between christians believes and what Bible litteraly said.
I've already demonstrated that Jesus is God. I don't need to respond to the rest of your post because there are clear statements that demonstrate the case. Well, there is one part that deserves a response:
Then why he did pray to his Father? Was that joke talking to himself? He spends whole nights just in pray.
YHWH his father answered to his prays all time. Also what was the meaning of Jesus last words " My God, why you leave me alone" before his death
Simply: Mark has a different Christology to John. Matthew and Luke, both of which copy Mark, just use the same line. John, which was written later, reflects later developments and schisms between what would become Rabbinic Judaism and Jews who would eventually become Christians. Your issue, though, is that Jesus praying to the Father isn't contradictory to Jesus being God because Jesus (the Son) is distinct from Jesus (the Father). You may had had a point if we looked at Mark or Matthew or Luke alone, but you can't ignore John's clear statements when they are included in the same Bible and intentionally included at that.
This isn't like the Hebrew Bible containing Goliath stories that contradict one another. This is more like Genesis containing two creation stories. Their inclusions were intentional and with purpose.