The serpent seed of Satan theory promulgates the concept that Satan engaged Eve in sexual relations with Eve and was thus Cain’s father; making Cain his literal son and meaning that Cain’s bloodline literally carry Satanic genetics.
Matthew 13 records Jesus’s telling of a parable thusly:
Behold, a sower went forth to sow; And when he sowed, some seeds fell by the way side, and the fowls came and devoured them up: Some fell upon stony places, where they had not much earth: and forthwith they sprung up, because they had no deepness of earth: And when the sun was up, they were scorched; and because they had no root, they withered away. And some fell among thorns; and the thorns sprung up, and choked them: But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold. Who hath ears to hear, let him hear.
The disciples asked Him, “Why speakest thou unto them in parables?” and He replied “Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.”
After some discussion, Jesus explain the parable:
Hear ye therefore the parable of the sower. When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.
But he that received the seed into stony places, the same is he that heareth the word, and anon with joy receiveth it; Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.
He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.
But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.
Note that, as emphasized above, this is about actions and not genetics; heareth, understandeth, received, dureth, offended, becometh unfruitful, beareth and bringeth.
Moreover, “the wicked one…catcheth away that which was sown in his heart” and does not sow a genetic bloodline / seedline through Eve. Mover, those who fail to produce fail to do so due to “tribulation or persecution…because of the word” and “the care of this world, and the deceitfulness of riches” and not genetics.
Jesus then tells another parable:
The kingdom of heaven is likened unto a man which sowed good seed in his field: But while men slept, his enemy came and sowed tares among the wheat, and went his way. But when the blade was sprung up, and brought forth fruit, then appeared the tares also. So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares? He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
We are also told:
All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them: That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.
Serpent seed of Satan theorists like this last statement because they fill it up with their theory and claim a new revelation kept secret from the foundation of the world.
The disciples specifically ask Jesus to elucidate “the parable of the tares of the field”:
He answered and said unto them, He that soweth the good seed is the Son of man; The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one…
We seem to be getting somewhere, into serpent seed of Satan theory territory, already since there is a juxtaposition between the “children of the kingdom” and “the children of the wicked one.” Jesus continues with:
The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels. As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world. The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.
Then shall the righteous shine forth as the sun in the kingdom of their Father. Who hath ears to hear, let him hear.
One must be careful when dealing with the issue of two seedlines as one could be claiming that there are two seedlines that are based on genetics (which is un, non, and anti-biblical) or that there are two seedlines that are based on actions, on sin and on rebellion (which is biblical). Simply stated, we know that “the children of the wicked one” are accounted as those committing wicked actions (not genetics). Yet, the issue is that Jesus explanation of this parable does not specify that specifically. This is why one must not take a text out of context to make a pretext for a prooftext.
The greater context of this issue is found in texts such as John 8 and 1 John 3 which do specify that it is about actions, sin and rebellion and not about genetics. Even YHVH’s statements and cursing of Cain in Genesis 4 make it clear that it was about actions and not about genetics.
John 8 has the Jews stating that they are “Abraham’s seed” and “Abraham is our father” and has Jesus agreeing that “ye are Abraham’s seed” and/but also stated, “Ye are of your father the devil.”
This is the case because of actions, sin and rebellion as the text emphasizes “continue in my word,” “know the truth,” “committeth sin,” “abideth,” “the deeds,” “love,” “lusts…ye will do,” “murderer,” “liar,” “honour” and “dishonor.”
1 John 3 refers to “the children of God” and “the children of the devil” which we can tell apart not based on genetics but based on “whosoever doeth not righteousness is not of God” and also “neither he that loveth not his brother” are of the devil. This text even specifies that Cain “was of that wicked one, and slew his brother” and provides a Q&A, “And wherefore slew he him?” it was “Because his own works were evil, and his brother’s righteous.”