"There are many sources that claim that Cain’s father was Satan whose real name was Samael"
https://simonarich.com/serpent-seedline-cain-hybrid/
"The first name is Yaldabaoth, the second is Saklas, and the third is Samael."
https://gnosticwarrior.com/yaldabaoth.html
"It is often called the Serpent seed, the dual seed or the two-seedline doctrine. It is a teaching which explains the biblical account of the fall of man by saying that the sin of Eve was not simple disobedience, but sexual contact with the serpent, and that Cain was the son of Eve and the devil. Cain's descendants are, according to this idea, the sons of Satan"
https://bereanbiblechurch.org/transcripts/john-epistles/1john_03_12_cain-the-serpent-seed.htm
"The Serpent seed, Satan’s seed, two-seedline, or dual seed doctrine is a controversial belief that Eve had sexual relations with Satan (The Serpent) in the Garden of Eden resulting in the birth of Cain – Satan’s own son."
https://serpent-seed.com/
"The first ruler defiled Eve and produced in her two sons, a first and a second: Elohim and Yahweh.
Elohim has the face of a bear,
Yahweh has the face of a cat.
One is just, the other is unjust.
He placed Yahweh over fire and wind,
he placed Elohim over water and earth.
He called them by the names Cain and Abel, with a view to deceive"
http://www.gnosis.org/naghamm/apocjn-meyer.html
"war is proclaimed between the seed of the woman and the seed of the serpent"
https://biblehub.com/commentaries/genesis/3-15.htm
"The “Seed of the Woman” thus becomes one of the identifying titles of the Messiah—the One who would redeem mankind from their predicament."
https://www.khouse.org/articles/2013/1151/