Genesis 1-4….The first four chapters of Genesis include creation, the fall, a hint of God’s mercy and the redemption to come (Genesis 3:15), as well as a preview of the character of fallen man (both Adam and Eve, and Cain). God creates everything by merely speaking, which shows how important and powerful His word is. He says, “Let us make…” in reference to humans, implying that the Son and Holy Spirit took part in creation. In the first act of prideful, unbelief, man is convinced he knows best, and decides to not listen to God, choosing to eat the fruit from the tree of knowledge of good and evil. Satan is able to convince Adam and Eve that disobedience to God will not have any eternal consequences. Death enters the world, and creation is cursed. This includes murderous inclinations in the hearts of all to follow, up to and including all of us, as well as sickness of every kind which will never be fully cured this side of heaven and/or Christ’s return (note: everyone that Christ healed eventually died). Creation is also cursed with enmity between predator and prey in the animal kingdom (Isaiah 11:6), and various other events which have occurred since (tornadoes, earthquakes, tsunamis, the rise and fall of human empires, wars, etc.). This will all one day be restored when Christ returns to finally conquer Satan and death, and the promise of this hope is seen in Genesis 3:15:
“And I will put enmity between you and the woman, and between your offspring and hers; he will crush your head, and you will strike his heel.”
Christ would suffer massively on the cross (i.e. struck on the heel), but the battle was won when He was raised from the dead (crushing Satan’s head). This is what would have been believed by those, who at the end of Genesis 4, began to call on the name of the Lord, trusting His promises and placing their faith in Him (Genesis 4:26).