In the event that it is not clear, or you have not been taught: Replacement theology - the belief that Christianity has replaced Judaism - is not scriptural.
Case in point: God deals with the children of Israel from Genesis to Revelation. Revelation 7 outlines how the remnant of the 12 tribes of Israel will be sealed first, and then after that a "great multitude, which no man could number, of all nations. ..." (This pertains to those of us who are Gentiles.)
So, let us be very careful when we speak of "replacement theology." It is not from the Holy Spirit, and could potentially lead to anti-Semitic thoughts and beliefs.
Although we have been grafted in through Yeshua/Jesus, we have not replaced God's originally chosen people, the Jews. And, we never will.
"I say then, Hath God cast away his people? God forbid. For I am also an Israelite, of the seed of Abraham, of the tribe of Benjamin. God hath not cast away his people which he foreknew.... Even so then at this present time also there is a remnant according to the election of grace. ... And so all Israel shall be saved. ..." (Romans 11: 1-2, 5, and 26)