"Replacement" whatever means what?
"Israel" in Roman's 11:26 means what?
"the Fig Tree" in Mark 13:28 means what?
"... the new Israel depicted in Isaiah 40–48 continued to be a struggling and weak people who needed constant exhortation to pursue obedience as well as encouragement to trust in God’s faithful love for them.
To fulfill God’s purposes, another, better Israel would be required, a servant who would take Israel’s place, doing what Israel was unable to do, fulfilling her calling to bring light to the nations (
Isa. 49:6).
This servant “Israel” took flesh in the person of Jesus Christ.
From the moment of His birth, He reenacted Israel’s history, going down to Egypt so that He could be the true son whom God called out of Egypt (
Matt. 2:15, quoting
Hos. 11:1).
Just as Israel passed through the Red Sea, Jesus passed through the waters of baptism (Matt. 3) before being led out into the wilderness, where He successfully faced the same temptations that Israel had failed to endure (Matt. 4).
At the beginning of His ministry, Jesus read aloud
Isaiah 61:1–2, declaring that the Scripture had been fulfilled in His hearers’ presence (
Luke 4:18–19): He was Himself the promised Servant upon whom God’s Spirit rested.
As the new Israel, Jesus perfectly fulfilled the demands of the law.
The new covenant that Jeremiah anticipated was established in His blood (
Luke 22:20).
Jesus fulfilled God’s original design for human holiness, thereby personally embodying the new Israel for which the prophets looked.
Since Jesus Christ is Himself the new Israel, all those united to Him by faith are also incorporated into the Israel of God (
Gal. 6:16).
He is the true vine, the classic Old Testament image for Israel, and we are His branches (John 15).
...
Being part of this new covenant Israel is, thus, not a matter of physical descent from Abraham, but rather sharing Abraham’s repentance and faith (
Luke 3:8).
The new people of God includes Jews and Gentiles together (
Gal 3:28), as both are grafted into the new olive tree, Christ/ Israel (
Rom. 11:17–24).
That does not mean that God has forgotten His promises to those physically descended from Abraham (
Rom. 11:1).
Certainly not.
But not everyone who is descended physically from Israel is part of the new Israel (
Rom. 9:6).
The restoration of Israel promised in the prophets is accomplished as the gospel is preached to Jerusalem and Judea (the southern kingdom), Samaria (the northern kingdom), and to the ends of the earth, thereby finally bringing God’s light to the Gentiles (
Acts 1:8).
This is from
The Church and Israel in the Old Testament by Iain Duguid
... as long as you don't 'make me believe' everything in a reference, but we ought to at least know as much as a Wetminster guy.