It clearly is garbage. And the proof is in what it clearly says written about who his father was written in
Gen. 4:
1: AND ADAM KNEW EVE HIS WIFE; AND SHE CONCEIVED AND BARE CAIN AND SAID, I HAVE GOTTEN A MAN FROM THE LORD.
2: AND SHE AGAIN BARE HIS BROTHER, ABEL. AND ABEL WAS A KEEPER OF SHEEP, BUT CAIN WAS A TILLER OF THE GROUND.
When Adam and Eve sinned, they immediately took on sinfulness within the heart and or soul as I see it.
But Cain and Abel had the same father who was Adam. So both also inherited sinfulness within themselves too. Just as we all do. Which is why it says what it does about it in Rm. 3:23. We are born in bondage to sin within. And that bondage that dwells within all of us, is the reason for the body or fleshly sins to exist too. Needing to be put under once the bondage has been crucified and buried in HIM. That is for all that do begin in HIM according to what is written in Rm. 63-6 of course. Which is why that baptism is a baptism of death. Or as Bro. Blume says. A baptism of emtpying out of the old man that brought forth sin within us to begin with, so that the NEW Man, who is Christ Jesus can begin within not only our spirits, but also taking over our hearts or what I see as souls also.
And both boys had this residing within them. As do we when we are born, until it is time for God to crucify and bury this as well. So that then Christ within us rules and reigns finally within, so that he then can proceed to also destroy the fleshly or bodily sins as well. Doing so as we walk in and after the spirit and not the flesh anymore.
Therefore this idea of serpent seed within some and not others is a fairy tale. Probably in order for some to think they are born better than others, possibly ending up being one of the children that God does describe written in Job. 41:34 possibly.
We are dependent on Christ totally for anything good that we will do, as well as ever do. Plus it was mainly for this deliverance to take place that the cross was necessary in the first place. Jesus telling us this in LK. 4:18-19. As we already had forgiveness sins thru the blood of animals. But not deliverance of the bondage to sin until after Jesus came to provide us with the way He speaks of that few find written in Mt. 7:14.
So you can have the idea that some are of the serpent and others not. We is all in the same boat in the beginning. And from then on dependent upon our obedience to God and His Word as to what boat we do end up in before the end. Hopefully it will be the Ark, the Ark of the Covenant that Christ cut finally, and not the other one.