Cain
Inheritance
Despite being a bastard, the inheritance was passed on to Cain when Adam accepted him in the womb of Eve. When Adam accepted Eve, he accepted Cain in her womb and Cain became his first-born heir. Similarly, when Joseph acceded to the instructions of the angel and accepted Mary, he accepted Christ in her womb as his first-born heir! A descendant of Cain is depicted in the Gospels as claiming the society as his own, which Christ does not rebuke, and a fact in which scripture agrees in places such as 1 John.
The birth of Christ undid the works of Cain and his descendants.
Yahweh's Challenge
Parallel with John the Baptist's Challenge to the Pharisees and Sadducees
Matthew 3:7 "But seeing many of the Pharisees and the Sadducees coming to the immersion he said to them: “Race of vipers! Who warned you to flee from the coming wrath? 8 Indeed you should make fruit worthy of repentance 9 and do not think to say among yourselves: ‘We have Abraham for a father’. For I say to you that Yahweh is able to raise up children for Abraham from these stones! 10 But already the axe is laid to the root of the trees: surely any tree not producing good fruit is cut down and cast into the fire!"
Yahweh could indeed raise up children to Abraham from stones – but that would not make them heirs, the seed of Jacob. Likewise, the Edomites among the Pharisees and Sadducees claimed to be the seed of Abraham and they were, through Esau, but Esau lost his inheritance for good.
Hebrews 12: “16 Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright. 17 For ye know how that afterward, when he would have inherited the blessing, he was rejected: for he found no place of repentance, though he sought it carefully with tears.”
The Pharisees and Sadducees came to the baptism, but they did not necessarily come to be baptized. Here John challenged the Pharisees and the Sadducees to do good, just as Yahweh challenged Cain to do good at Genesis 4:7: “If thou doest well, shalt thou not be accepted?”, although He knew that Cain could not ever do well.
The “axe is laid to the root of the trees”: Salvation is race-based. The only race with the favor of Yahweh are the children of Israel. For the children of Edom and all of the other non-Israelite bastards, their fate has already been decided: and of each of them it is the entire tree which shall be cut down. This is not merely a pruning of the branches, but an elimination of the trees! If your family tree is not found written into the Book of Life from the founding of Society – if you are not one of the creation of Adam – then you have no part in the Kingdom of heaven.