Hello Bill, this will be brief as I am about out of time, even now responding when I should get going.
But you raise some points that I have to disagree with, and, I hope that will not mean we cannot discuss this in a brotherly fashion.
Back to the point I stopped on; We know from Mal. 3:6a that God is the unchanging God and when we look at John 1:1-3 we learn that Jesus is that God! In the Bible that Jesus, Paul, Peter and all the other followers of Jesus taught from, known to us as the Old Testament, Jesus/God promised the Jewish Believer, not the nation of Judah nor the nation of Israel, that they were His Chosen People for a thousand generations. (Due. 7:9, Exo. 20:6 and Psa. 108:5)
(Worthy of note: God did not have, because of the lack of language and writing skills at the time, the ability to highlight or to emphasize by any other means that would be understood, than to repeat Himself. It, therefore, follows that when God says a thing twice, it is important and if He says it three times, we had better pay attention.)
I would not disagree with any of this, but, I will point out that the end conclusion is syllogistic in nature, and it is the premises that I hope to discuss with you.
So it is that calling one´s self a New Testament Christian and the idea of New Testament Theoligy are oxymorons.
First, I would just point out, as I am sure you are aware, that in the New Testament, "testament" a "covenant" are the same word, being translated different only.
That there was a change in ministry of God in the life of believers can be seen clearly in many passages and on many points.
One would be the distinct difference of ministry concerning the conviction of sin. righteousness, and judgement.
Under the First (or Old) Covenant, this was fufilled by scripture, our tutor which, as all of scripture does, is meant to lead us to Christ...not the law, or, the First Covenant, or, the Old Covenant. We can call it "old" because it has been replaced by the New.
The law is said, as is Moses, to be a servant. But Christ is He Who buildeth all things. Christ is not a servant over God's House, as the law was, but is "a Son over His own House." (c.f. Hebrews 3)
Okay, I said this would be brief, and am making a liar of myself...lol. So onward ho!
New Testament theology almost always removes the promises of God in the Old
Testament to the Jewish Believer and places the Modern Day Christian follower of the New Testament, exclusively, into their position.
No need for that. I agree that we can view there as being only one true covenant, as we can see that all covenants which really have their beginning in Genesis 3:15 (no pun intended), and fulfillment threads its way through scripture utilizing, not distinguishing, or setting apart, all of them.
So it is, you see, this is just a renaming of Replacement Theology.
While there may be those that hold to replacement theology, I am one that affirms that believers are under...the New Covenant. I did a post, and to my knowledge, no-one has responded. Perhaps you might look at it to see a glimpse of my views concerning the New Covenant.
So I have to protest (and not too loudly..lol) that replacement theology is not a position that all those that believe the New Covenant started on the Day of Pentecost in full embrace.
Now about, "God has, in all of history made just one covenant with His Creation." It is essential to understand one key point in Christian Theology that is almost, exclusively, never taught because it then requires a very thorough exposition being taught for the entirety of scripture and teachers, like most other people are lazy, including myself. The point is that the first 39 books of the Christian Bible are the Holy Bible!
Understanding the New Covenant is really not that difficult. We can in a very short time understand the concept of Christ bringing in the New Covenant, ratified by His blood, as the Covenant of Law was ratified by the blood of animals.
Do not jump the gun, I have not disavowed the New Testament!
Just the New Covenant...lol.
Be back in a bit...