Jesus' first words in the gospel of Mark are "The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel." (Mark 1:15, ESV) Paul summarizes the ministry of John the Baptizer: "John baptized with the baptism of repentance, telling the people to believe in the one who was to come after him, that is, Jesus." (Acts 19:4, ESV) The nouns for repentance and faith/belief appear together again in Acts 20:21. I'm wondering if there's a connection between the two concepts and that they're not just two indepedent commands, as I think this sort of statement is often taken, but one command put two ways.
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Paul's statement about John in Acts 19 seems to be saying that John's message was to repent, i.e. to believe in the one who was to come after him, Jesus. In the next chapter, Paul tells the Ephesian elders in his farewell address to them that the message he preached was of "repentance toward God and faith in our Lord Jesus Christ" (the same Greek word is used for faith here and belief in the other two passages). One further passage makes the connection. The author of Hebrews says his recipients don't need to keep laying the basic foundation but need to move on to deeper things. That basic foundation is " of repentance from dead works and of faith toward God". The same one foundation is those two things. So maybe they're not really two things at all. We might read the statement in Mark a little differently in light of all this.

And Jesus came and said to them, "All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age." (Matt 28:18-20, ESV)

I realized something at a baptism last year about Matthew 28's Trinitarian formula. It doesn't just use a Trinitiarian formula that assumes enough of a parity between Father, Son, and Holy Spirit to put them in the same sentence in parallel. I've seen commentators mention this, but it's not a strong enough argument that all three persons of the Trinity are fully God. After all, you could list God, the church, and the world in parallel like that, although here there's a sense of commonality and joint authority in addition. One thing occurred to me that I had to go check the Greek to be sure of. Jesus talks about the name of the Father, the Son, and the Holy Spirit. This 'name' is singular, one name for the Father, the Son, and the Holy Spirit. The name of the Father is 'YHWH' (Hebrew at the time didn't have written vowels), also called the tetragrammaton and covenant name of God. I can't think of another name that these three persons could share. Anyway, that's not the sort of thing those who deny the Trinity but want to affirm the scriptures will be able to deal with easily. Even the fact that there's one name they fall under is some threat to that view.
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I think the clearest statement at least of the divinity of Jesus is in Philippians 2:1-11, but it will take some work to draw it out. Some common misreadings of what Paul says there (due to the infelicities of English renderings) hinder what I think would have been an obvious implication of the text to its original readers.