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
The Garden Of Eden Revisited
In order to understand the reason for the flood of Noah, I believe it’s rather important to first start in the passage above. This pronouncement from God to the serpent (the nachash i. e. Satan) and Eve, is missed by many people. When Eve was beguiled by the nachash, by eating the forbidden fruit, this set and wound the clock towards the eradication of all evil in the universe. People generally assert that evil entered into the world with Adam and Eve disobeying God, but don’t usually recognize that a deceiver  was already moving freely throughout the garden before they fell! It is not the purpose of this article to describe all the effects of the fall in the garden, but one major change was that sin entered into the DNA of mankind. And at that point, they/we needed a savior.