What is the Scriptural Basis Against the Trinity Trinitarianism, or the Trinity, is the belief that God exists as three persons (God the Father, God the Son, and God the Holy Spirit) seperate, but co-equal.

This view is labelled as a heresy by some denominations and orthodoxy by others. What are common Biblical and theological arguments against trinitarianism?
I can't argue from my own personal conviction, so these might not be the strongest arguments unitarians would assert. As much as it pains me not to offer the counterarguments, I will give them their say.

God is One

Critics of trinitarianism will point to there being almost no mention of any "persons of the Godhead" in the Old Testament (exceptions: Ge 1:26, Ge 11:7), and many instances of there being only one God. They will describe the three "persons" of the Trinity as being three separate gods because they are not a single, identical individual.

From the New Testament, they point to passages that suggest a fundamantal disunity between Jesus and God.


  John 17:3
  "This is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent."
  
  Mark 13:32 (NASB)
  "But of that day or hour no one knows, not even the angels in heaven, nor the Son, but the Father alone."
  
  1 Timothy 2:5 (NASB)
  For there is one God, and one mediator also between God and men, the man Christ Jesus, ...
  
  1 Corinthians 8:6 (NASB)
  yet for us there is but one God, the Father, from whom are all things and we exist for Him; and one Lord, Jesus Christ, by whom are all things, and we exist through Him.
  
  Ephesians 4:5-6 (NASB)
  one Lord, one faith, one baptism, one God and Father of all who is over all and through all and in all.


Some will also point to statements of Jesus submitting to the Father as proof of disunity.

Not-Biblical

Some will argue that the word "trinity" is not used in the New Testament, and that the Trinity is not equated with God in the same way that Jesus is.

Some will assert that the idea was not present in the early church.

Some will assert that because every mention (or some sort of numerical majority) of God does not simultaneously mention Jesus and the Holy Spirit, the Biblical authors cannot be asserting trinity.

Illogical

Some will argue that it just doesn't make sense (1+1+1=1?) and that God is not a god of confusion, and so since the idea of the Trinity is less emphatically asserted in the text (compared to Jesus' divinity, the need for Salvation, etc.), it is not an idea that ought to be embraced.

Some will argue that any time the Father knows something that Jesus doesn't, it makes no sense for Jesus to be God. Similarly, any time Jesus &lt;verb&gt; to the Father, such verbs are not reflexive and thus a trinitarian interpretation doesn't make sense.

Resources


Testimony of Scripture Against the Trinity
Oneness Versus Trinity
lots of links to oneness and trinity articles
Response to "Should You Believe in the Trinity?"
(It's anti-unitarian, but it does at least present their assertions fairly.)
Exposing Weak Arguments Against the Trinity
and the Deity of Jesus
(Again, this is anti-unitarian, but it does put forward the common assertions.)