You say God deals with us thru "dispensations". I say nonsense, He deals with us through Grace.
Which Israel?
Rom. 9:6 Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel.
Amos 9:9 For, lo, I will command, and I will sift the house of Israel among all nations, like as corn is sifted in a sieve, yet shall not the least grain fall upon the earth.
There are those who are born "of Israel," and those who are reborn into Spiritual Israel. But, the second verse I quoted makes the difference very ambiguous. I really do believe the solution to this problem cannot be discovered in our age.
Hank