Deu 6:4 Hear, O Israel: The LORD our God is one LORD:
Deu 6:5 And thou shalt love the LORD thy God with all thine heart, and with all thy soul, and with all thy might.
Isa 44:8 Fear ye not, neither be afraid: have not I told thee from that time, and have declared it? ye are even my witnesses. Is there a God beside me? yea, there is no God; I know not any.
Isa 43:10 Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
Isa 43:11 I, even I, am the LORD; and beside me there is no saviour.
1Co 8:6 But to us there is but one God, the Father, of whom are all things, and we in him.
Eph 4:6 One God and Father of all, who is above all, and through all, and in you all.
Isa 52:5 Now therefore, what have I here, saith the LORD, that my people is taken away for nought? they that rule over them make them to howl, saith the LORD; and my name continually every day is blasphemed.
Isa 52:6 Therefore my people shall know my name: therefore they shall know in that day that I am he that doth speak: behold, it is I.
Isa 9:6 For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
Joh 14:7 If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
Joh 14:8 Philip saith unto him, Lord, shew us the Father, and it sufficeth us.
Joh 14:9 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, Shew us the Father?
Joh 14:10 Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works.
Rom 1:3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh.
Gal 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
Gal 4:5 To redeem them that were under the law, that we might receive the adoption of sons.
Exo 20:3 Thou shalt have no other gods before me.
Not to debate one God, or a trinity, but those that believe in a trinity better be right.
If it is one God who is a Holy Spirit, and Father is a title for God, and the Son is the man Christ Jesus, and Father, Son, and Holy Spirit is not 3 persons in one God, but the three relationships God has with His saints designated by titles, Father-Creator, and parent of the saints, Son-God's visible relationship to the saints, Holy Spirit-God's invisible relationship to the saints, and they teach a trinity they will be accountable.
Also consider this.
The Old Testament says that Adam was made in the image of God, and the New Testament says Adam was made in the figure of Him to come who is Jesus.
The image of God is the image of Christ.
God had the plan to come in the future in flesh before He started creation, and created Adam in that image.
So the let us make man in our image has to include the man Christ Jesus and Adam was made in the image of Christ.
So is the let us make man in our image a trinity, or is it God the Father, and the Son, the man Christ Jesus, a prophetic statement to the coming Son of God.
Which Jesus is the beginning of creation, and the firstborn among the creatures, although He was not born until 4000 years later.
Baptize in the name of the Father, Son, and Holy Spirit, not names, but name singular, and those are titles not names.
In the Old Testament God said He would reveal a new name to the Jews, and speak to them.
Jesus said to Philip if He has seen Him, he has seen the Father, and the words He speaks are not His own, but the Father that dwells in Him, He does the works.
And Jesus said He came in His Father's name.
Which the Son inherited the name from the Father, and the prophet Agur asked what is God's name, and what is His Son's name if you can tell, which means they would share the same name.
The Holy Spirit comes in the name of Jesus.
Jews, Gentiles, and Samaritans, were all baptized in the name of Jesus.
All we do in word or deed we do all in the name of Jesus, and there is no other name by which we are saved but the name Jesus.
It appears as if the name of the Father, Son, and Holy Spirit is Jesus, and Jesus created all things, came in flesh, and dwells in the saints.
Jesus is at the right hand of God.
Jesus said all power is given unto Him in heaven and earth.
There is one God, and one mediator between God and men, the man Christ Jesus.
There is one throne in heaven, and one who sits on it.
Which is the throne of God and the Lamb, God in the glorified body of the man Christ Jesus.
David said the LORD said unto my Lord, sit at my right hand until I make your enemies your footstool.
For the Son must reign until all His enemies are conquered, and when they are conquered the Son shall submit to God, the Father, that God may be all in all.
It appears as if God exalted the man Christ Jesus to sit at His right hand, exercise the throne of power until all His enemies are conquered then the Son shall submit to the Father, stop being at the right hand that God may be all in all.
For the Son will reign until His enemies are conquered being His footstool, then He shall not be at the right hand.
It appears as if the only person we will see in heaven is Jesus which if you have seen Him you have seen the Father.
If people teach a trinity, and there is not one they will be accountable.
It could be when the Bible says one God it means one God.
Something to consider.