"Neither the word Trinity, nor the explicit doctrine as such, appears in the New Testament, nor... in the Old Testament." - The New Encyclopedia Britannica, 1985, Micropedia, vol. 11, p. 928.
Trinitarians themselves admit that "The Trinity...is an INFERRED doctrine, gathered ECLECTICALLY from the entire Canon". - page 630 of the highly trinitarian publication, Today's Dictionary of the Bible, Bethany House Publishers, 1982.
Not only is the doctrine not found in the Bible, but there are literally hundreds of Scriptures and passages that prove to be large problems for the belief that the Trinity (see definition) is Scriptural. Acts 2:33 is but one of them.
Acts 2:33 says in the New Living Translation:
"Now he [Jesus] sits on the throne of highest honor in heaven ("highest position"; GOD'S WORD Translation), at God's right hand. And the Father, as he had promised, gave him the Holy Spirit to pour out upon us, just as you see and hear today."
First, if Jesus really is God, then wouldn't the place of "highest honor in heaven" be the position of being God Himself rather than being at "God's right hand"?
Also see: How can Jesus be God and also sit at His right hand? (Search For Bible Truths)
Second, if Jesus really is God, then how can Jesus be "exalted" in the first place?
Third, if Jesus really is God, then why is God mentioned as a separate and distinct individual FROM Jesus in this Scripture?
Fourth, only the Father is equated to being God in this Scripture which is consistent with the rest of the Bible. The Bible repeatedly makes it clear that there is only one Almighty God and that only the Father "whose name alone is Jehovah" is God. (Psalms 83:18; 1 Cor. 8:6; Ephesians 4:6; Rom. 15:6; 2 Corinthians 11:31; Revelation 1:6; etc.) Jesus himself acknowledged this. (John 17:3)
Also see: The Father (Jehovah) is God Alone (Examining the Trinity)
This Scripture ALSO shows how the supposed third person of the Trinity (the Holy Spirit) is not God nor even a person.
Fifth, notice how the NT Greek Lexicon describes the Holy Spirit as "this" at Acts 2:33 which identifies the Holy Spirit as a thing - not a person:
Sixth, also notice that God poured out [ekxeo, ekxew] His Holy Spirit. In all cases ekxeo ("poured out") refers to things. Holy Spirit, then, is a thing that may be poured out in portions. (See Num. 11:17, 25 and Acts 2:17,18 where God poured Holy Spirit from His Holy Spirit.) You simply do not pour out persons in measured portions upon other persons!
Also see: Is the Holy Spirit really a thing that can be poured out into portions? (Search For Bible Truths)