2. The only true God is the One who has revealed Himself in the Scriptures.
If we believe something different, then we do not believe in the true God. We are pagans.
– Stuart Olyott

3. The Trinity

6. There is only One God Proof Texts:
Hear, O Israel: The LORD our God, the LORD is one. [Deut 6:4]
I am the LORD, and there is no other. [Isa 45:6]
You believe that God is one; you do well. Even the demons believe--and shudder! [James 2:19]

8. The Father is God Proof Texts:
... you, O LORD, are our Father, our Redeemer from of old is your name. [Isa 63:16]
See what kind of love the Father has given to us, that we should be called children of God...[1John 3:1]
... there is one God, the Father, from whom are all things and for whom we exist... [1Cor 8:6]
Note: Minimum of 16 proof texts stating The Father is God

10. The Son is God Proof Texts:
Jesus said to them, “... I say to you, before Abraham was, I am." [John 8:58]
... from the [Jews] ... is the Christ, who is God over all ...[Romans 9:5]
In the beginning was the Word ... and the Word was God. [John 1:1]
Note: Minimum of 77 proof texts stating The Son is God

11. The Son is God Proof Texts:
The writer of Hebrews refers to Jesus: "Thy throne O God is forever and ever...” [Heb. 1:8]
Other prophets introduced their message by saying "Thus saith the Lord...” but Jesus spoke on His own authority saying, "I say unto you...” [Matt. 5:18, 20, 22, etc.]
Jesus claimed that God's angels were actually His angels. [Luke 12:8-9 compare to Matthew 13:41]
Note: Minimum of 77 proof texts stating The Son is God

13. The Holy Spirit is God Proof Texts:
The Holy Spirit said, "...for I have sent them Myself ..." Impersonal forces do not send men. [Acts10:19-20]
“I appeal to you ... the love of the Spirit, to strive together with me ...” [Rom 15:30]. How could one talk of "love of the Spirit" if the Spirit was just a way of describing a ‘force?’
“... the blasphemy against the Spirit will not be forgiven.” [Math. 12:31]. Who could do these things if the Holy Spirit were an impersonal power?
Note: Minimum of 89 proof texts stating The Holy Spirit is God

14. The Holy Spirit is God Proof Texts:
Men are baptized in His Name [Matthew 28:19]
The Holy Spirit speaks [John 16:13-16], Testifies [John 15:26], Teaches [Luke 12:12], Convinces [John 16:8-11], Searches [2 Corinthians 2:10-11], Calls [Acts 13:2], Reveals [1 Corinthians 2:10-11], Loves [Romans 5:5], etc.
Men can lie to Him [Acts 5], Grieve Him [Ephesians 4:30], Call upon Him [Ezekiel 37:9 ], Outrage Him [Hebrews 10:29].
Note: Minimum of 89 proof texts stating The Holy Spirit is God

18. One God – Three Persons Proof Texts:
The Son prays to the Father: “... Father, glorify Me in your own presence with the glory that I had with You before the world existed. [John 17:5]
They mutually use the pronouns I, Thou, He and Him when speaking to or of each other. [Matt. 17:5; John 16:13; et al]
The Father sends the Son, and the Father and the Son send the Holy Spirit who acts as their Agent. [John 14:26; John 16:7; 1 John 3:1; John 8:58; Matt. 10:40]
Note: Minimum of 14 proof texts the one God is three distinct Persons

19. Other Trinity Passages
Proof Texts:
The Apostolic Benediction: “The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit, be with you all.” [1 Corinthians 8:6]
Great Commission: “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, [Matt 28:19]
Birth of Jesus: “... the angel answered her, ‘The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy--the Son of God.’” [Luke 1:35]

21. Errors to Avoid Tritheism: Three gods who are all of the same sort.
Monarchianism: Failure to hold that there are three Persons who are equally God.
Modalism: God is an actor who plays three different parts.