So is it the Father or Son in Revelation 1:8? The modifier is in verse 7. Discussed again in verse 9.
In verse 6 Jesus has made us to be a kingdom to serve his God and Father.
Verse 7 describes Jesus "coming with the clouds", the reference being Daniel 7:13, where "one like a son of man" approached the "Ancient of Days" and was lead into His presence.
Next, in verse 8 the Lord God, "Alpha and Omega" speaks: clearly the Father Himself.
In verse 9, John himself speaks of the "word of God and the testimony of Jesus."
I understand those to be two separate beings.
This is presented in understandable form here.
FRiend, there are references and modifiers throughout those verses, so I "get" that somebody might wish to understand them differently.
But I don't see why a different understanding necessarily makes one a "God Damned Heretic".