So if someone says "I was told by God to say the following" then that person isn't the subject of prophecy? OK. Well then, this must really limit your understanding of Is 42 (and possibly Jer 51). But whatever floats your boat.
Why is that vanity? Isaiah is proclaiming his mission. You are labeling that vanity? And why should it have the "backing" (whatever you mean by that) of anyone else? He has his mission, they have theirs. Now you are judging Isaiah's motives and telling other prophets their job. That's a bit arrogant.
You have a strange idea of what prophecy is then. (This, I already know, because you insist that all text is prophetic.) The prophet gives the message he is commanded to give. It might be about past, present or future. If it includes information about the prophet then the prophet speaks it. And, no, they don't speak of "his Christ" except for Moses who does speak of false prophets...
Remember, the words are important -- so when the text uses words that, if read consistently, speak of Abraham, then the text is about Abraham whether you like it or not. The biblical text uses the word "adoni" for Abraham and the word in Ps 110 is adoni. Unless you think that that is some sort of coincidence. And what's all this about "everlasting glory"? I don't see that in Ps 110 (or Daniel 7:14).
And "salvation"? What are you talking about? Is 61 has the prophet proclaim his mission -- to give people the news of future redemption and victory. "Arm of salvation"? If you make things up, you end up with a mass of confusion, and you have that in spades.
You say here, 'Remember, the words are important -- so when the text uses words that, if read consistently, speak of Abraham, then the text is about Abraham whether you like it or not. The biblical text uses the word "adoni" for Abraham and the word in Ps 110 is adoni. Unless you think that that is some sort of coincidence. And what's all this about "everlasting glory"? I don't see that in Ps 110 (or Daniel 7:14).'
I'd like to examine what you say.
Does the text use the word 'adoni' to refer to Abraham in Psalm 110:1? This is an important issue to resolve.
In Genesis 24, Abraham is spoken about as 'my master' (adon) by his servant. So a hierarchy of 'masters' is evident in scripture, with the LORD God seated on the throne above all angels and men. Where in this hierarchy does Abraham stand? Well, in Genesis 18:12, we are told that Sarah called Abraham 'my lord'. Yet, in 18:3, Abraham bows himself before the 'three men', calling one of them 'My Lord' [see 18:27, where, in comparison with the Lord, Abraham is but 'dust and ashes']. So, this proves that a 'Lord' (adon) exists between Abraham and the LORD. This, in turn, demonstrates that the one seated at the right hand of the LORD in heaven is not Abraham! If Abraham has a Lord that is not the LORD, then a mediator exists between the LORD and Abraham.
Now, let me ask you this: Is it possible to see God? In Exodus 33:20 it says, 'But," He [the LORD] said, "you cannot see My face, for man may not see Me and live" ' [JPS]. However, in Exodus 24:10 it says, 'they saw the God of Israel', which would be strange if it were a vision, given that 'Moses and Aaron, Nadab and Abihu, and seventy elders of Israel' all saw the God of Israel at the same time! How do you explain this?
If we apply the readings of the Torah to the book of Psalms then we have an issue. Abraham, who is become 'dust and ashes', cannot be the Lord to whom he himself bows down! And is the Lord of Genesis 18:27 not also the LORD with whom he has a conversation?
The only way in which these apparent inconsistencies can be resolved is by understanding 'the face of God' to be 'the glory of God' and this means that the Lord can come to earth, as Christ.