Replacement theology is just another one of the many doctrines of men. The “mystery” that Paul taught was that the Church—which includes Gentiles—would be partakers (Colossians 1:12) of the promise and inheritance, not replacers of the original heirs, Israel.
The Gentiles are grafted into the tree God already planted and nurtured—the Jewish people (Romans 11:24).
The Church is an awesome and marvelous realization of the eternal plan of God, but it is not a replacement for Israel, nor does its existence or purpose supersede God’s intention to fulfill His promise to His covenant people: a King and a Kingdom in their promised land.
Child of God, husband, father, grandfather, rabblerouser, songwriter, pot stirrer, waiting for the King.