Scripture disagrees:
Jesus preached the """gospel of the kingdom"""
Matt 4:23 And Jesus went about all Galilee, teaching in their synagogues, and """preaching the gospel of the kingdom""", and healing all manner of sickness and all manner of disease among the people.
Matt 9:35 And Jesus went about all the cities and villages, teaching in their synagogues, and """preaching the gospel of the kingdom""", and healing every sickness and every disease among the people.
Mar 1:14 Now after that John was put in prison, Jesus came into Galilee, """preaching the gospel of the kingdom"""
This is 100% Jewish doctrine. Preached by a Jew to the Jews & pertains to promises made exclusively to the chosen peoples forefathers.