Your dispensational blindness is preventing you from seeing that the new covenant, the only covenant by which sins can be taken away, was already put into affect long ago!
Matthew 26:28 This is my blood of the new covenant, which is poured out for many for the forgiveness of sins.
Has the Deliverer not already come out of Zion to turn away ungodliness from Jacob? He sure did!
Acts 3:24 Yea, and all the prophets from Samuel and those that follow after, as many as have spoken, have likewise foretold of these days. 25 Ye are the children of the prophets, and of the covenant which God made with our fathers, saying unto Abraham, And in thy seed shall all the kindreds of the earth be blessed. 26 Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away every one of you from his iniquities.
In Romans 11:26-27, Paul was not giving a new prophecy, he was referencing an OT prophecy from Isaiah 59:20-21. In Acts 3:24-26, Peter indicated that "all the prophets from Samuel and those that follow after, as many as have spoken, have likewise foretold of these days" which were the days when Jesus died for their sins (and the sins of the Gentiles as well) and rose again from the dead. So, those prophets include Isaiah. Peter said that Samuel and the prophets who came after him, like Isaiah, foretold the death and resurrection of Jesus Christ that would result in the Deliverer/Redeemer coming to turn away ungodliness from Jacob and that is exactly what He did, according to Peter! What more does He need to do for them than what He has already done? Nothing! He said "It is finished."!
So, with all this in mind, Paul had to be speaking of Spiritual Israel and not national Israel when he indicated that all Israel would be saved in the manner prophesied in Isaiah 59:20-21. It can only be said of Spiritual Israel that all who are part of it are saved, not national Israel. If you understood Romans 9:6-8 properly then you would likely understand Romans 11:26-27 properly as well.
