Many scriptures are used to establish a Unitarian position, check the following:
Jesus was created
Colossians 1:15-16 (NIV)
The Son is the image of the invisible God, the firstborn over all
creation. 16 For in him all things were created: things in heaven and
on earth, visible and invisible, whether thrones or powers or rulers
or authorities; all things have been created through him and for him.
Revelation 1:1, 3:14 (ESV)
The revelation of Jesus Christ, which God gave him to show to his
servants the things that must soon take place. He made it known by
sending his angel to his servant John...14"And to the angel of the
church in Laodicea write: 'The words of the Amen, the faithful and
true witness, the beginning of God’s creation.
Many Bible commentators agree, the Son is referred to as wisdom personified (Proverbs 8:22 footnote: a). According to RS, NE, and JB, the one there speaking is said to be “created.”
Jesus was/is inferior to God and Father
Matthew 20:23 (NIV)
Jesus said to them, “You will indeed drink from my cup,
but to sit at my right or left is not for me to grant. These places
belong to those for whom they have been prepared by my Father.
Revelation 1:1 (NIV)
The revelation from Jesus Christ, which God gave him to show his
servants what must soon take place. He made it known by sending his
angel to his servant John
John 14:28 (NIV)
“You heard me say, ‘I am going away and I am coming back to you.’ If
you loved me, you would be glad that I am going to the Father, for the
Father is greater than I.
1 Corinthians 8:6 (NIV)
yet for us there is but one God, the Father, from whom all things came
and for whom we live; and there is but one Lord, Jesus Christ, through
whom all things came and through whom we live.
1 Corinthians 3:23 (NIV)
and you are of Christ, and Christ is of God.
1 Corinthians 15:24,28 (NIV)
Then the end will come, when he hands over the kingdom to God the
Father after he has destroyed all dominion, authority and power...When he has done this, then the Son himself will be made subject to him who put everything under him, so that God may be all in all.
1 Corinthians 11:3 (NIV)
But I want you to realize that the head of every man is Christ, and
the head of the woman is man,[a] and the head of Christ is God.
For I have come down from heaven not to do my will but to do the will
of him who sent me.
“But about that day or hour no one knows, not even the angels in
heaven, nor the Son, but only the Father.
Therefore God exalted him to the highest place and gave him the
name that is above every name,
Jesus isn't Almighty God
John 20:17 (NIV)
Jesus said, “Do not hold on to me, for I have not yet ascended to the
Father. Go instead to my brothers and tell them, ‘I am ascending to my
Father and your Father, to my God and your God.’”
Now this is eternal life: that they know you, the only true God, and
Jesus Christ, whom you have sent.
Matthew 4:10 (NIV)
Jesus said to him, “Away from me, Satan! For it is written: ‘Worship
the Lord your God, and serve him only.’”
Holy Spirit is not a person
Luke 1:41 (NIV)
When Elizabeth heard Mary’s greeting, the baby leaped in her womb, and
Elizabeth was filled with the Holy Spirit.
Matthew 3:11 (NIV)
“I baptize you with water for repentance. But after me comes one
who is more powerful than I, whose sandals I am not worthy to carry.
He will baptize you with the Holy Spirit and fire.
Acts 10:38 (NIV)
how God anointed Jesus of Nazareth with the Holy Spirit and power, and
how he went around doing good and healing all who were under the power
of the devil, because God was with him.