“Christ Pantocrator,” from the 13th-century Deesis Mosaic in Hagia Sophia. (Wikimedia Commons/Public Domain)
“Jesus Christ is true God and true man, in the unity of his divine person; for this reason he is the one and only mediator between God and men.” (CCC 480)
To hear atheists and even liberal self-identified “Christians” tell it, the doctrine that Jesus is the incarnate God and Second Person of the Holy Trinity, is supposedly utterly unclear in the Bible, or even absent altogether. This is not the case at all.
There are literally hundreds of relevant passages, that I myself have compiled with regard to the Holy Trinity and also the divinity of Christ. Demonstrating this was one of my earliest research projects, as a budding Christian apologist: way back in 1981, fresh out of college.
The New Testament refers to the Father, Who is God. This is basically the same concept as the God of the Old Testament, as understood by the Jews: an immaterial eternal spirit Who created the world, is all-good, is the Judge of the world, and is omnipotent, omniscient, and omnipresent.
We need not spend any further time on that. There are a great many clear passages that could hardly be interpreted in any other way than that Jesus is God in the flesh. Here is a generous sampling:
John 1:1, 14 (RSV) In the beginning was the Word, and the Word was with God, and the Word was God. . . .  And the Word became flesh and dwelt among us, full of grace and truth; we have beheld his glory, glory as of the only Son from the Father.
John 10:30 I and the Father are one.
Jesus’ hearers, unbelieving Jews, certainly understood His intent in saying this, because they tried to stone Him, as the next verse informs us, since they didn’t believe His claim, which, if indeed untrue, would be intolerable blasphemy. 10:33 informs us that they tried to stone Him because (in their words) “you, being a man, make yourself God.”
John 20:28 Thomas answered him, “My Lord and my God!”
If it were untrue, Jesus would have corrected Thomas, but He didn’t.
Colossians 1:19 For in him all the fulness of God was pleased to dwell,
In context, it is the Son Who is being described (1:13); He is eternal (1:15, 17-18), the Creator (1:16), and the unifying principle of the universe (1:17; cf. Heb 1:3): all attributes true only of God. Paul makes the notion even more explicit in the next chapter:
Colossians 2:9 For in him the whole fulness of deity dwells bodily,
2 Peter 1:1 . . . our God and Savior Jesus Christ: (cf. Titus 2:13)
Hebrews 1:8 But of the Son he says, “Thy throne, O God, is for ever and ever, the righteous scepter is the scepter of thy kingdom.”
Hebrews 1:8 is a remarkable passage, in which God the Father calls His Son “God.” It is a reference to the Old Testament passage, Psalms 45:6-7.
In Hebrews 1:6, God the Father also says that all the angels should worship God the Son. Worship can only be rightly applied to God, as we know from Exodus 34:14 and Deuteronomy 8:19. Yet Jesus accepted worship of Himself on many occasions (e.g., Mt 14:33; 28:9) and stated that He should be honored equally with the Father (Jn 5:23).
In Revelation, we find that Jesus is worshiped in every way that the Bible specifically describes worship of God the Father, with all the same words used:
Revelation 5:8, 12-13 And when he had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb, each holding a harp, and with golden bowls full of incense, which are the prayers of the saints;  . . . “Worthy is the Lamb who was slain, to receive power and wealth and wisdom and might and honor and glory and blessing!”  And I heard every creature in heaven and on earth and under the earth and in the sea, and all therein, saying, "To him who sits upon the throne and to the Lamb be blessing and honor and glory and might for ever and ever!" (cf. 4:9-11; 7:11-12, Rom 11:33; Col 2:6-7)
Jesus is omnipotent:
Philippians 3:20-21 . . . the Lord Jesus Christ,
 who will change our lowly body to be like his glorious body, by the power which enables him even to subject all things to himself.
And He is omniscient:
Colossians 2:2-3 . . . Christ,  in whom are hid all the treasures of wisdom and knowledge.
Many attributes that are said to belong only to “God” are applied to Jesus in Scripture. God the Father said, “besides me there is no savior” (Is 43:11; cf. 1 Tim 4:10). Yet Jesus is called the “savior” of mankind in passages like Luke 2:11 and many others.
God the Father stated, “To me every knee shall bow, every tongue shall swear” (Is 45:23). The same exact description is also applied to Jesus:
Philippians 2:10-11 that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,
 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
The Bible teaches that “God” is judge (1 Sam 2:10; Ps 50:6; Ecc 12:14; many others). But so is Jesus:
John 5:22-23, 27 The Father judges no one, but has given all judgment to the Son,  that all may honor the Son, even as they honor the Father. He who does not honor the Son does not honor the Father who sent him. . . .  and has given him authority to execute judgment, because he is the Son of man. (cf. 9:39; Acts 10:42; 2 Tim 4:1)
Therefore He is God. God the Father sits on His throne in heaven (1 Ki 22:19; Ps 11:4; 47:8). Jesus is on the same throne, too (Rev 7:17; 22:1, 3).
At every turn in the New Testament, only one conclusion is possible, to make sense of all these statements, taken together as a whole: Jesus is God the Son. He is the eternal, all-powerful, all-loving, self-existent Creator God.