“In Scripture there is as yet no single term by which the Three Divine Persons are denoted together. The word {tri’as} (of which the Latin trinitas is a translation) is first found in Theophilus of Antioch about A.D. 180 . . . Shortly afterwards it appears in its Latin form of trinitas in Tertullian.” The Catholic Encyclopedia, 1912, Vol. 15, Trinity page 47)
Most scholars date the Didache late first century to early 2nd century.
There is no need to rely on tradition when the word of God speaks for itself.
“You are my witnesses, saith the Lord, and my servant whom I have chosen: that you may know, and believe me, and understand that I myself am. Before me there was no God formed, and after me there shall be none.
I am, I am the Lord: and there is no saviour besides me.” Isaiah 43:10-11
"I am the Lord that maketh all things; that stretcheth forth the heavens alone; that spreadeth abroad the earth by myself; Isaiah 44:24
For unto us a Child is born,
Unto us a
Son is given;
And the government will be upon His shoulder.
And His name will be called
Wonderful, Counselor, Mighty God,
Everlasting
Father, Prince of Peace Isaiah 9:6-7
Here Jesus is referred to as the Son and the Everlasting Father
Just as he is referred to as the Root and the Offspring of David
Speaking of Jesus, "Who is the image of the invisible God, . . Colossians 1:15
Jesus is God in the flesh, not a separate person in the godhead.
“And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.” I Timothy 3:16
The only “person that did all these things is Jesus”
Jesus speaking to the Father "And I have declared unto them thy name, and will declare it. . . " John 17:16 The only name he ever declared was Jesus. So he declared to the disciples that God’s name is Jesus.
Jesus tells his disciples, “If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
Philip saith unto him, Lord show us the Father, and it sufficeth us.
Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Show us the Father?” John 14:7-10
Jesus speaking of the Holy Ghost:
“Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.” John 14:17
Jesus spoke as if the disciples already knew the Comforter that would come. Because it would be Jesus himself that came back to them in Spirit.
All of the John chapters 14-17 speak of God’s oneness.
And Jesus answered him, The first of all the commandments is, Hear O Israel; The Lord our God is
one Lord." Mark 12:29
“For it pleased the Father that in him should all fullness dwell:” Colossians 1:19
“For in him (Christ) dwelleth all the fullness of the Godhead bodily.” Colossians 2:9
Jesus is not in the godhead, the godhead is in Jesus.
“Thou believest that there is
one God; thou doest well: the devils believe, and tremble.” James 2:19
“And immediatley I was in the spirit: and behold a throne was set in heaven, and
one sat on the throne.” Revelation 4:2
Hebrews tells us that when Jesus walked the earth that was the “days of his flesh, when he had offered up prayers and supplications . . .” Hebrews 5:7
Ephesians 1:11 teaches us that God worketh all things after the council of his own will.
When Jesus prayed to the Father, he counciled his own will.
Jesus said," I have power to lay it down (his own life) and I have power to take it again." John 10:18
Did the Father or Jesus raise Jesus from the dead? One God
In the Angel’s announcement to Mary he told her "The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee; therefore also that holy thing which shall be born of thee shall be called the Son of God. " Luke 1:35
So is the father of Jesus the Holy Ghost or God? One God
Being seated at the right hand of the Father? The right hand is referred to dozens of times in the Bible and always speaks of a position or place of power.
Well I have barely scratched the surface of the scripture concerned God’s oneness. It is not so crazy to believe that there is One God and that One God manifested himself as the Son and as the Holy spirit. I mean He can be in two places at once can’t he?

How many thrones will you see in Heaven?
I personally prayed to God for clarification of who He is and He confirms His Oneness always. I am going to bow out because I have a large family and am neglecting them as I type this long post. I wish you all the best as you follow Christ.