For the record, I’m not convinced with the arguments against trinitarianism. I would like to share one other set of verses that leans me more toward the Trinity:
The first thing to note, of course, is the phrase “Alpha and Omega”. Once we establish the identity of this reference, we will get a clearer idea of who is speaking. This phrase hearkens back to the first chapter of Revelation:
“Alpha and Omega”, being the first and last letters of the Greek Alphabet is the equivalent to term “the first and the last” in Isaiah 44:6:
This speaks not only of His eternal nature, but also His exclusiveness to being God. There are no other gods besides Him. And no only this, but He apparently does not share in His glory:
As we keep that in mind, let us consider the term “the Almighty”. This is a clear reference to Almighty God (Gen. 35:11, ) and is connected to Jehovah (YHWH) (Exodus 6:3).
So there can be no doubt that this Alpha and Omega is YHWH, the Almighty God.
[size=150]B[/size][size=150]U[/size][size=150]T[/size], look at Rev 1:11-13:
This SAME voice that has been established as Almighty God appears to John in a description throughout the rest of the chapter as the glory of one like the Son of Man. And furthermore the SAME voice states:
So this Son of Man, who is called “the Alpha and Omega”, the Almighty God, tells John that He lived, then died, and behold lives forevermore. There is ONLY ONE PERSON who has ever risen from the dead and is still living. And if that is not enough to convince you that the identity here of Son of Man (aka the Almighty God) is Jesus Christ, you can reference in the Rev 1:13-16, with the description in Rev 19:11-16 (with the eyes as the flames of fire, and the sharp two-edged sword), as the KING of KINGS, and LORD of LORDS, the WORD of GOD!
So going back to Rev 21:6-7, the Alpha and Omega, who is Jesus Christ, will be to him "that overcometh shall inherit all things; and I will be his God, and he shall be my son, a direct reference to Ezekie 37:27, the covenanial God who will dwell in the tabernacle of His people.
Now if you don’t believe the book of Revelation, I don’t know what to tell you, but the inferences as rather strong pointing to one God, with Jesus Christ as that God.