Can't you see that 2P2P tries to go both ways here, not one and then the other? It tries to think that both parties were right? so it comes up with this idea that he had a gospel ABOUT the kingdom and then that got rejected. He did not, and it doesn't say that. That is a 2nd gen misunderstanding of the grammar. The Greek never says that. The one gospel simply belongs to the kingdom and they both march forward.
Abram
1st covenant.
(second gospel to the uncircumcised)
promise
Gen 15:5 And he brought him outside and said, "Look toward heaven, and number the stars, if you are able to number them." Then he said to him, "So shall your offspring be."
Gen 15:6 And he believed the LORD, and he counted it to him as righteousness.
blood shed
Gen 15:9 He said to him, "Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon."
Gen 15:10 And he brought him all these, cut them in half, and laid each half over against the other. But he did not cut the birds in half.
abram was asleep (faith only)
Gen 15:12 As the sun was going down, a deep sleep fell on Abram. And behold, dreadful and great darkness fell upon him.
God confirmed the covenant
Gen 15:17 When the sun had gone down and it was dark, behold, a smoking fire pot and a flaming torch passed between these pieces
Abraham
2nd covenant.
(first gospel to the circumcised)
promise
Gen 17:5 No longer shall your name be called Abram, but your name shall be Abraham, for I have made you the father of a multitude of nations.
Gen 17:6 I will make you exceedingly fruitful, and I will make you into nations, and kings shall come from you.
Gen 17:7 And I will establish my covenant between me and you and your offspring after you throughout their generations for an everlasting covenant, to be God to you and to your offspring after you.
bloodshed and covenant confirmed each time the
work of circumcision is done.
Gen 17:10 This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised.
amazing how God worked the dispensations in reverse.