I think something should be noted and made very clear here.
The Bible writings are directly inspired by the Holy Spirit to each writer. Their wording in the verses are purposeful - they gave pinpointed prophecies which I doubt they even realized that were pointing right to Christ and what would be fulfilled; they were just being LED to write these very things supernaturally.
(things they couldn't possibly know yet).
[We can't very well claim that "because the OT writers didn't realize they were prophecies of Christ at that time - or even by the disciples upon seeing Jesus fulfilling them that THEY AREN'T OT PROPHECIES OF JESUS AT ALL"... Just like we can't claim that "some people in the church didn't grasp that Jesus was God yet, so..... JESUS THEREFORE CANNOT BE GOD, it's pagan heresy".
THE WORDING IS ALL THERE AND DIRECTLY TEACHES HE IS GOD and that the 3 are the One True God. Further, the early Christian churches DID embrace it as truth upon finding it. Creeds were even demanded to keep nontrinitarian heresies from infiltrating the churches].
I think it's important to remember that in the OT they didn't know about all the details we know today by the NT writings when Christ revealed them to the Disciples.
BUT NOW WE HAVE THE FULL MYSTERY REVEALED TO US.
That's why I believe in earlier times, they didn't grasp the Trinity early on -- but the Trinity and Deity of Christ are directly displayed in and through the writings but still needed to be fully put together by the readers later.
My belief is that the actual identity of God (Christ is Deity/Trinity) are A HIDDEN MYSTERY that is not overtly shown openly, yet shown in great detail to be found by us upon reading; just as the prophecies were given by the OT writers who had no idea what they were yet.
Meaning, it's spelled out, yet not spelled out at the same time. Jesus IS called God in 2 direct passages - yet people are ignoring them both -- He calls Himself "I AM" as a name... which is a claim of Deity directly in John 8 (which the People even understood as such) - that gets shunned & excused away.
IT IS THERE, but people can manipulate that to deny or alter the meaning.
(as they do w/ the homosexual condemnation verses too - as well as many others to suit their preferences).
2 Peter 3:16
as also in all [Paul's] letters, speaking in them of these things,
in which are some things hard to understand, which the untaught and unstable distort (twist), as they do also the rest of the Scriptures, to their own destruction.
The Trinity is drawn right out for us - but it's something one has to collectively put together, and those who do, SEE & KNOW THE MYSTERY OF GOD in His true identity; which is somewhat veiled -- yet openly taught.
Ignorance is not rejection - there's a difference. No, people don't have to fully understand the Trinity - you don't have to even know Jesus is God to be of Him.
BUT ONCE YOU ARE SHOWN & TAUGHT, YOU CANNOT DENY AND REJECT HIS IDENTITY upon the revelation of it. That is a denial & rejection of His person and the written scriptures that do spell it out.
God's word is Spiritually Discerned.
1 Corinthians 2:14
But a natural man does not accept the things of the Spirit of God,
for they are foolishness to him;
and he cannot understand them, because they are spiritually appraised.
Mt. 16:
15 He said to them, "But who do you say that I am?"
16 Simon Peter answered, "You are the Christ, the Son of the living God."
17 And Jesus said to him, "Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven.
John 6:44
"
No one can come to Me unless the Father who sent Me draws him;
and I will raise him up on the last day.
Matt. 16
[16 Simon Peter answered, "You are the Christ,
the Son of the living God."...]
20 Then He warned the disciples that they
should tell no one that He was the Christ.
Luke 4:41
Demons also were coming out of many, shouting,
"You are the
Son of God!" But rebuking them,
He would not allow them to speak, because they knew Him to be the Christ.
Luke 10:21
At that very time He rejoiced greatly in the Holy Spirit, and said,
"I praise You, O Father, Lord of heaven and earth, that
You have hidden these things from the wise and intelligent
and have revealed them to infants.
Yes, Father, for this way was well-pleasing in Your sight.
Notice what the Sanhedrin are understanding of Jesus' claim in being "Son of God":
Mat. 26
63 But Jesus remained silent.
The high priest said to him, "I charge you under oath by the living God:
Tell us if you are the Christ, the Son of God."
64 "Yes, it is as you say," Jesus replied. "But I say to all of you: In the future you will see the Son of Man sitting at the right hand of the Mighty One and coming on the clouds of heaven."
65 Then the high priest tore his clothes and said, "He has spoken blasphemy! Why do we need any more witnesses? Look, now you have heard the blasphemy. 66 What do you think?"
"He is worthy of death," they answered.
[*they blindfolded Jesus first*
Luke 22:64
They blindfolded him and demanded,
"
Prophesy! Who hit you?"]
67 Then they spit in his face and struck him with their fists. Others slapped him
68 and said, "
Prophesy to us, Christ. Who hit you?"
From their understanding of His claim of being SON OF GOD - they're automatically tying in that He should be able to do something supernatural that normal people cannot do - there's an automatic understanding that His claim is to be linked with DEITY.
Not just that all followers of God are called 'sons of God' - they don't ask regular people who are 'sons of God' to prove they can do miracles...
And other passages are showing us that Christ didn't want to be OPENLY identified earlier on in His ministry yet when He told certain people not go out & reveal His identity yet.
So there's a veiling/hiding going on during His ministry for awhile.
DEITY is involved with the term "Son of God" - as being the lineage/of the order of GOD Himself. This page article goes into detail about the significance of the term was in their day and language
http://www.ccg.org/english/s/p211.html
I know this is 'all over the place' -- but the concept I'm relaying is that there's more going on here in the terminologies of their day and in Jesus' ministry (as we see antitrinitarians demanding "Show me where it comes right out and just says 'I JESUS, AM GOD'" or "if there's a Trinity, "Show me where the Bible says "I GOD, AM A TRINITY"' - ie. the WORD Trinity has to be there or else it's false
). The Bible is written in that it gives the GRADUAL REVELATION OF TRUTH over a span of thousands of years.
The Trinity/Deity of Christ ARE interwoven thruout it from OT to NT -- it's plainly given, yet there's a mystery within it - it's also veiled to where the Father Himself has to reveal His identity for us to accept Him for who He is.
And this is a strong reason why Christianity is the ONLY religion that embraces Christ AS GOD and a TRINITY!
No other religions accept that as true. WHY NOT?
Is it hidden from them?? I say yes, it is!