Note that in a scene from point (1), there were two human beings on earth; for point (2) there were four human beings.
Today, how many people do you kill every day?
Reread the situation: (Genesis 4: 6-12)
The Creator asks Cain: Why have you been angry, and why has your countenance fallen? If you do well, will you not be exalted? and if you do not do well, (if you do wrong?) sin is at the door; with all this, he will desire you, and you will rule over him ... What have you done? The voice of your brother's blood cries out to me from the ground.
The sentence of curse is repeated:
(1) Given to the father: 'Cursed shall the land be because of you; with pain you will eat of it all the days of your life '(Gen. 3:17)
(2) Given to his son: 'Now then, cursed are you from the earth, which opened his mouth to receive your brother's blood from your hand' (Gen. 4:11)
But the flood did not come because of the sin of Adam and Eve, and even less because of the murder done by Cain. But because "the fallen angels, the so-called sons of God" (which is different from the sons of men) began to live with the daughters of men (Gen. 6: 2); And just like Adam and Eve, they had a son that he killed… Also these sons of the sons of God (evil angels or cursed by the Creator) in their curse made all humanity pervert. Hence the phrase: "As it was in the days of Noah"
Quoting: As it was in the days of Noah: They ate, drank, married and were given in marriage, until the day that Noah entered the ark, and the flood came and destroyed them all (Luke 17-26-27)
What do you mean did they marry and give each other in marriage (hunting? Sex hunting !?)
He will leave it up to your interpretation, but he refers to the libertine way of having sex: evil angels with the daughters of cursed men.