@Jodi Hi Jodi,
CAIN IS THE FATHER OF LIES. HE WAS A MURDERER FROM THE BEGINNING.
NONSENSE
Gen 4.6
Then the Lord said to Cain,
‘Why are you angry? And why has your countenance fallen?
If you do well, will not your countenance be lifted up?
And f you do not do well, SIN IS CROUCHING AT THE DOOR
and it’s desire is for you, but you must master it.

SIN IN THE FLESH, which Jesus overcame and condemned, ( Rom 8.3) is the motivating influence for natural men.
The god of this world mastered Cain.