Here is the scriptural account...
1 Now the serpent [Satan
having come down in human form and seducing Eve using the tactics of a snake]
proved to be the most cautious of all the wild beasts of the field [he
became the most cunning of the angels who reject outright God's authority]
that Jehovah God had made. So it began to say to the woman [Eve]:
Is it really so that God said you must not eat from every tree of the garden?
2 At this the woman said to the serpent: Of
the fruit of the trees of the garden we may eat.
3 But as for [eating] of the fruit of the
tree that is in the middle of the garden, God has said, 'You must not eat from
it, no, you must not touch it that you do not die.'
4 At this the serpent said to the woman: You [plural]
positively will not die.
5 For God knows that in the very day of your
eating from it your eyes are bound to be opened and you are bound to be like
God, knowing good and bad.
6 Consequently the woman saw that the tree
was good for food [the literal tree and tasy
literal food upon it] and that it was something to be longed for to
the eyes [the tree and its fruit were good
looking], yes, the tree was desirable to gain wisdom [literally
eating would give her wisdom] [lyk#h].
So she began taking of its fruit and eating it. Afterward she gave some also to
her husband when with her and he began eating it.
7 Then the eyes of both of them became opened
[they understood the game that Satan had
played with them and they woke up sexually too] and they began to
realize that they were naked [both physically,
since they had discovered the power of the lower regions and spiritually since
they began to appreciate their moral naivety]. Hence they sewed fig
leaves together and made loin coverings for themselves (Genesis 3).
43 Why is it you do not know what I am
speaking? Because you cannot listen to my word.
44 you are from your father the Devil, and
you wish to do the desires of your father. That one was a manslayer [he
did not murder Eve because she also had an angelic body. He did kill her human
body, so he was a manslayer] when he began, and he did not stand fast
in the truth, because truth is not in him [although
he was in the truth until he turned to the lie]. When he speaks the
lie, he speaks according to his own disposition, because he is a liar and the
father of [the lie] (John 8).
He who has been created is beautiful [any angel, and child born to living parents], but you would <not> find his sons [begotten sons such as the Nephilim] noble creations. If he were not created, but begotten, you would find that his seed was noble [Abraham was begotton but his seed is noble]. But now he was created (and) he begot [Satan did this with Eve. Eve could only beget after she sinned, since begetting by sexual reproduction is the preserve of the dead. God allows people to have children without his consent only if these children are dead. So first Satan enticed Eve to sin and die judicailly as a human but not as an angel. Then he slept with her and made her pregnant then he conspired with her to murder Adam who lost his human soul and his angelic soul. Eve never lost her angelic soul and so was not murdered. Actually Eve did not die, she was raptured when her human body gave out, since she had an angelic soul and was not baptized into a covenant that required death]. What nobility is this? First, adultery came into being, afterward murder [Satan first seduced Eve and committed adultery with her not because she was married to or engaged to Adam, but because he was an angel and she was a human as explained below]. And he [Cain] was begotten in adultery, for he was the child of the Serpent [Satan came down in human form to seduce Eve, and Cain was carried and delivered by Eve]. So he became a murderer/manslayer, just like his father, and he killed his brother [Abel]. Indeed, every act of sexual intercourse which has occurred between those unlike one another is 'adultery'/necrozoan bestiality [Satan mating with Eve was adultery of this type. It is a living being having illegal procreative sex with a dead being. The dead beget within marriage, the living create within a child rearing agreement. The two should not cross fertilise each other]. (Philip - gnostic writings)
Now the trees were real trees and Eve was a real woman but the snake was plainly not a real snake because real snakes cannot talk. The first naive solution to this problem is to say that the snake was used as a ventriloquists dummy by Satan, but the Gnostic writing shows that Satan commited Adultery with Eve, something that he could not have achieved as a snake. Furthermore Eve declaring that she had produced Cain with the aid of Jehovah and not with Adam, and Cain not being Adam's seed but Abel being such confirms that Cain was a physical son of Satan, begotton by Satan and Eve.
Now marriage is an institution for the dead, so Adam and Eve were not married in the garden, and actually they could not have procreated in the garden they could only have created a child on God's behalf since both were living. So Satan did not sin against Adam in adultery, but he did sin against the first holy spirit covenant which he mediated. So he was unfaithful as God's wife. This actually destroyed the first holy spirit covenant and God lost his first wife as so many humans do today.
He also committed what we call necrozoan bestiality with Eve, since he was judicially living and she was judicially dead at the time that they begat Cain, and the living should not beget, they must create on behalf of God.
This of course was the great attraction to Satan. He was not interested in giving God any more children, he wanted children of his own to whom he could be God. So he needed Even to sin in order that she would be able to beget, to procreate without a consent being required from an angelic priesthood. Satan would then become the father of a human race through Cain, rather than God being their father through Adam. So he perusaded Eve to sin, then he persuade her to sleep with him, and then she perusaded Adam to sin by sleeping with him.
So Satan began as a manslayer of Eve, not a murderer of her, since she had a second angelic body at her disposal. And he began as a liar, telling her that 'they' would not die. Actually Eve did not die judicially since she had no idea that she was committing adultery and since she was decieved by Satan who lied to her.
14 Also, Adam was not deceived, but the woman was thoroughly deceived and came to be in transgression (1 Timothy 2).
Eve herself was only under the law of do not eat from the tree, so she was not guilty of adultery. And in any event she had no idea what adultery was since marriage had not yet ever occurred since no human had yet died judicially. So she was absolutely nowhere with this stuff, and must have been well suprised when she discovered that sex lead to pregnancy, something that was not the case with pre-adamics.
Cain was therefore a cross breed really, the first Nephilim, and he could procreate and therefore so could the Nephilim.
But Adam did die in both of his bodies as a result of his sin (and is still dead today), so since Satan told Eve that both of them would positively not die, he lied in respect of Adam.