Jesus Christ Was praying to his Father who is God at John 17:3. It's my understanding that the Jews believed that Yahweh was the only true God so it's my understanding that it was Yahweh God who they prayed to. Jesus Christ there at John 17:3 said that the one he was praying too was the only true God, so Jesus Christ wasn't in any way saying he was Yahweh God.
Context matters.
Joh 17:3 And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent. (ESV)
First, notice that eternal life is in knowing
both the Father and the Son. Second, that Jesus calls the Father "the only true God,"
does not preclude Jesus from also being truly God. This is proven by additional context:
Joh 17:5 And now, Father, glorify me in your own presence with
the glory that I had with you before the world existed. (ESV)
But, what did Yahweh say?
Isa 48:11 For my own sake, for my own sake, I do it, for how should my name be profaned?
My glory I will not give to another. (ESV)
Is Jesus contradicting what Yahweh said? Let's first look at something John said:
Joh 12:36 While you have the light, believe in the light, that you may become sons of light.” When Jesus had said these things, he departed and hid himself from them.
Joh 12:37 Though he had done so many signs before them, they still did not believe in him,
Joh 12:38 so that the word spoken by the prophet Isaiah might be fulfilled: “Lord, who has believed what he heard from us, and to whom has the arm of the Lord been revealed?”
Joh 12:39 Therefore they could not believe. For again
Isaiah said,
Joh 12:40 “
He has blinded their eyes and hardened their heart, lest they see with their eyes, and understand with their heart, and turn, and I would heal them.”
Joh 12:41
Isaiah said these things because he saw his glory and spoke of him. (ESV)
Who does John say Isaiah saw in "his glory and spoke of him"? Clearly, John is meaning that
Isaiah saw the glory of Jesus, or rather, the Son. Looking at the context of what Isaiah was talking about:
Isa 6:1 In the year that King Uzziah died
I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple.
Isa 6:2 Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew.
Isa 6:3 And one called to another and said: “
Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory!”
Isa 6:4 And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke.
Isa 6:5 And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips;
for my eyes have seen the King, the LORD of hosts!”
…
Isa 6:8 And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am! Send me.”
Isa 6:9 And he said, “Go, and say to this people: “‘Keep on hearing, but do not understand; keep on seeing, but do not perceive.’
Isa 6:10 Make the heart of this people dull, and their ears heavy, and
blind their eyes; lest they see with their eyes, and hear with their ears, and understand with their hearts, and turn and be healed.” (ESV)
So, who did Isaiah actually see? He saw Yahweh in all his glory. Yet, John says that Isaiah saw Jesus (the Son), which confirms that Jesus shared in the glory of the Father prior to creation. Once again, John supports what he said in John 1:1--that the Word was in intimate, interpersonal relationship with God for all eternity past, meaning that the Word is also God in nature. He then became flesh in the person of Jesus.
Also at John 20:17 after Jesus Christ had been resurrected from the dead he said he had a Father and God who was his apostles and disciples Father and God. Now as I said it was Yahweh God that the Jews believed to be the only true God and again Jesus Christ isn't saying he's Yahweh God.
Once again, context matters. A passage about the humanity of Christ that doesn’t preclude him from also being God. Remember, Jesus had already told them that he came from above, from the Father, in whose glory he shared before creation (all of which John also discusses in his prologue), and was going to return to the Father. He is simply returning to the place and position in glory from which he came.
Jesus says, “to
my Father and
your Father, to
my God and
your God.” He doesn’t use “our.” He is saying that is that his Father is now their Father but that there is a difference in relationship, in his sonship and theirs. His God is also their God, or, their God is his God, in that as a man, he still prayed to the Father as the one true God. But that in no way precludes Jesus from also being truly God. It is rather one of the main points of John’s gospel. Jesus is simply here stressing the new closeness of relationship between the disciples and God.
We see this in additional context:
Joh 20:24
Now Thomas, one of the twelve, called the Twin,
was not with them when Jesus came.
Joh 20:25 So the other disciples told him, “We have seen the Lord.”
But he said to them, “Unless I see in his hands the mark of the nails, and place my finger into the mark of the nails, and place my hand into his side, I will never believe.”
Joh 20:26 Eight days later, his disciples were inside again, and
Thomas was with them. Although the doors were locked,
Jesus came and stood among them and said, “Peace be with you.”
Joh 20:27 T
hen he said to Thomas, “Put your finger here, and see my hands; and put out your hand, and place it in my side. Do not disbelieve, but believe.”
Joh 20:28 Thomas answered him, “My Lord and my God!” (ESV)
The immediate context is of the resurrected Christ repeating Thomas's specific declarations for evidence back to him, despite Jesus not having been there when Thomas stated them, and then invites Thomas to investigate the evidence. The text literally reads: "Answered Thomas and said to Him 'The Lord of me and the God of me'." Thomas is clearly saying
to Jesus that he is his Lord and his God.
https://biblehub.com/interlinear/john/20.htm
In John's gospel, from the beginning to the end, Jesus is shown to be truly man and truly God.