Now, at this time, are you prepared to say that God was lying when He made His promises to the literal nation of Israel when the Church was thousands of years away from being established?
Jeremiah predicted that the new covenant would come in the future:
Jer_31:31 "Behold, the days are coming, says the LORD, when I will make a new covenant with the house of Israel and with the house of Judah—
Christ confirmed this new covenant and confirmed that his blood was the agency of this covenant:
Luk_22:20 Likewise He also took the cup after supper, saying, "This cup is the new covenant in My blood, which is shed for you.
Paul knew this and confirms that the new covenant was for the church that was established on Pentecost as seen in Acts 2:
2Co 3:5 Not that we are sufficient of ourselves to think of anything as being from ourselves, but our sufficiency is from God,
2Co 3:6 who also made us sufficient as ministers of the new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.
Paul believed that the church were ministers of the new covenant and saw that the spirit of God, through Christ, was what made the new covenant a better promise...a promise of eternal life:
Heb_8:6 But now He has obtained a more excellent ministry, inasmuch as He is also Mediator of a better covenant, which was established on better promises.
and we know from promises God made to Israel, and not the Church, in the New Covenant that have not yet been fulfilled but which require a literal, functioning nation of Israel for fulfillment, then we know that it is impossible that the Church is Israel.