In support of Trinity (literally taken from the Bible)

1. For starters, apostle Thomas said to him, “My Lord and my God!” (John 20:28); that is, Thomas did call Jesus God! (literally)

2. When Christ is addressed separately from the Father (say in 1 Timothy 2:5 or when He prayed to the Father), it’s simple: It just proves that Jesus being God, is a “separate Person” of the manifestation of God as the Son (for from point 1 & 3 below, we know that Jesus is God!)

3. Here’s the “literal logic”:

(i) “In the beginning was the Word, and the Word was with God, and the Word was God” (John 1:1)

(ii) “The Word became Flesh (Jesus) and made His dwelling among us.” (John 1:14)

Replace “The Word” = Jesus derived from (ii) and put it in (i) to obtain (literally):

“In the beginning was “Jesus”, and “Jesus” was with God, and “Jesus” was God” (John 1:1)

4. Next, Paul writes: “Who (Jesus), being in the form of God, thought it not robbery to be equal to God,” (Philippians 2:6)

Literally again, the “only One” equal to God is “God Himself”. The “separation” in ‘mentioning’ proves that they are “Two distinct Persons” (God Who is able to do all things chose to manifest Himself in such a Way)

5. Only God can be “worshiped”. All other “worship” not directed to God is “idolatry”. Jesus was “worshiped” and the Bible nor Christ or His apostles mention any “correction” to this act of “Jesus being worshiped”.

(i) Worshiped by “men”. Examples: John 9:38; Luke 24:52; Matthew 14:33; Matthew 28:9.

(ii) Worshiped by “all” angels of God: “And again, when God brings his firstborn into the world, he says, “Let all God’s angels worship him.”” (Hebrews 1:6)

6. The Father, Son and Holy Spirit “separately” (distinctly mentioned) below proves “three Persons and only three Persons in which God chose to manifest Himself”:

(i) “Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,” (Matthew 28:19) – baptizing done in the name of “God” alone and cannot be in a “creation’s name”. Thus since “Father, Son & Holy Spirit” are mentioned, One God in Three Persons may be inferred “literally”.

(ii) Similarly, apostle Paul’s benediction also mentions the Three Persons of the “GodHead” meaning they are at the “same level” in the next verse:

“May the grace of the Lord Jesus Christ, and the love of God (Father, since both Jesus & Holy Spirit are mentioned separately in this verse), and the fellowship of the Holy Spirit be with you all.” (2 Corinthians 13:14)

7. If Jesus is not “God”, then a “divine creation/creature” died to “save us”. Wrong. Why? Only God saved us by Him making Himself flesh (this manifestation is called the Son of God = Jesus).

8. Regarding your “other points” such as the ‘titles’ of Christ being called a ‘priest’, ‘prophet’ etc… These are just His “titles” and we sharing some of it does NOT disprove that “He is God”.

Just like here on earth, a “man” can have the “title” of being a “father”, “son”, “engineer” and a “husband” at the same time!.

9. “Mystery of the GodHead” revealed:

(i) “I and the Father are one.” (John 10:30) – So the “One” here signifies “One God” has “manifested Himself as Two Persons” – all things are possible to Him.

(ii) Briefly in Christ’s prayer below:

“I have given them the glory that you gave me, that they may be one as we are one–” (John 17:22) – Note that in His Prayer, Christ clearly mentions the “two” separate “ones” – namely, “creation being made one” (they may be one) just as “we are one” (The Father and Jesus being One).

10. Christ was not “created”. His “pre-existence” revealed mysteriously via the verse below too:

“”Very truly I tell you,” Jesus answered, “before Abraham was born, I Am!” (John 8:58) – Christ reiterated that He is speaking the “Truth” (Truly)
in that He “pre-existed” and that He is that “I Am” Who identified Himself to Moses at the burning bush! (literally taken)

11. Even His “enemies” knew/understood Christ’s words at that time in that “Jesus claimed to be God”:

“We are not stoning you for any good work,” they replied, “but for blasphemy, because you, a mere man, claim to be God.” (John 10:33)