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28 And Thomas answered and said to Him, “My Lord and my God!”

Indeed. It should be obvious that by attributing uniquely Divine titles, glory and powers to the Son of God, the Holy spirit is teaching He is God, sharing the same nature as the Father, light from light, true God from truie God, even though, as in a marriage, there are positional distinctions, so that the Son is subject to the Father, while we are aliens to God unless we are made "accepted in the Beloved."

Other texts in John which reveal Christ as being God are those in which He is declared to be the I AM of Ex. 3:14

And he said unto them, Ye are from beneath; I am from above: ye are of this world; I am not of this world. I said therefore unto you, that ye shall die in your sins: for if ye believe not that I Am, ye shall die in your sins. (John 8:23-24)

Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am. (John 8:58)

Jesus therefore, knowing all things that should come upon him, went forth, and said unto them, Whom seek ye? They answered him, Jesus of Nazareth. Jesus saith unto them, I Am. And Judas also, which betrayed him, stood with them. As soon then as he had said unto them, I Am, they went backward, and fell to the ground. (John 18:4-6)

In all these there is no "he" in the Greek after "I Am." Likewise in Jn. 5 the Lord uniquely claimed to be the Son of God, which then was a claim to oneness of nature. .

Therefore the Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal with God. (John 5:18)

But also called God his own Father (alla kai patera idion elege ton theon). “His own” (idion) in a sense not true of others. That is precisely what Jesus meant by “My Father.” See Rom_8:32 for ho idios huios, “his own Son.” - WORD PICTURES IN THE NEW TESTAMENT by Archibald Thomas Robertson

And one of the most subtle teachings on the Deity of Christ is that which begins with the question, "who is this Son of man?" (John 12:34)

John goes on to tell us that that Jesus is the Lord whom Isaiah saw high and lifted up in glory when Isaiah made was is one of the most quoted OT texts seen in the NT.

Therefore they could not believe, because that Esaias said again, He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them. These things said Esaias, when he saw his glory, and spake of him. (John 12:39-41)

Thus,

Jesus cried and said, He that believeth on me, believeth not on me, but on him that sent me. (John 12:44)

I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty. (Revelation 1:8)

And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life. (1 John 5:20)

More by God's grace.

O worship the King, all glorious above...