Answer:
Without the establishment of the covenant with faithful Abraham, his son, Isaac, and his descendants, the children of Israel [Jacob], his grandson... the promise of the Christ would not exist:
"...in thee shall all the families of the earth be blessed." (Gen.12:3)
Whether you're speaking of the first half of Christ's ministry, that was cut short by His timely murder:
"...when the fulness of time was come, God sent forth His Son, made of a woman, made under the law, to redeem them that are under the law, that we might receive the adoption of sons." (Gal.4:4-5)
Or whether you're speaking of the "second half" of that ministry, which Jesus will complete upon His return to earth in Power and Glory.
Neither the "history of Israel" nor the [first or] "second coming of Christ" exist without each other.