>> “Gentiles have been made partakers of their spiritual things” <<
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Their spiritual things are the scriptures, the “Oracles of God.”
Those scriptures were carried forward by the house of Judah, and no one else. All others on Earth owe a debt to Judah for maintaining the scriptures and the necessary supporting traditions.
How preposterous. Changing the meaning of scripture to somehow support your “theories” will not serve you well. Trying to claim that all who are saved are genetic descendents of the Israelites is tantamount to denying God’s word.
Revelation 2:9 I know thy works, and tribulation, and poverty, (but thou art rich) and I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan.