The Church is the New Israel. Bloodline, Jewish or Gentile, counts for nothing. But the Church is open to every bloodline, Jew and Gentile alike, so there is no "replacement." All are welcome in Christ's Church, the New Israel.
Acts 10:34
Then Peter began to speak: “I now realize how true it is that God does not show favoritism.
Yes, this. The Church does not "replace" Israel. The Church becomes Israel.
"In speaking of a new covenant, he makes the first one obsolete. And what is becoming obsolete and growing old is ready to vanish away."
Hebrews 8:13. Jesus inaugurated the New Covenant spoken of by the prophet Jeremiah at the Last Supper, rendering the Old Covenant "obsolete." It's hard to see how scripture could be any clearer.
The true "doctrine of demons" is the Zio-centrism to which so many professing Christians today -- invariably of the whacky "Dispensationalist" variety -- adhere today.
The Church is all saved belivers, not an orginization.