Replacement theology (however defined ) railed against by some members on here, the ultimate evil they say!
Denying the finished work of Christ Jesus for all people not a problem, which is in direct contradiction to the NT.
So really where does the evil lay?
Paul makes it clear......
“I will make my dwelling among them and walk among them,
and I will be their God,
and they shall be my people.
Therefore go out from their midst,
and be separate from them, says the Lord,
and touch no unclean thing;
then I will welcome you,
and I will be a father to you,
and you shall be sons and daughters to me,
says the Lord Almighty.”
Paul audaciously quotes and alludes to a host of Old Testament texts here -- Leviticus 26, Ezekiel 37, Isaiah 52, Ezekiel 20, and 2 Samuel 7, to name a few.
Paul includes the Corinthians in the lineage of Israel when he tells them the first generation of Israelites are "our ancestors" (1 Corinthians 10:1).
Though the Corinthians are not ethnically part of Israel, they enjoy complete identification with Israel through their position in Christ, the embodiment of true Israel. The Corinthians
must embrace their identity as true Israel and the true temple of God by not morally compromising. Christian living flows naturally from our identification as Israel.
*cited from Reformation Theology