In Genesis 3, God described the awful sin and rebellion of Adam and Eve. Enticed by satan, first Eve and then Adam yielded to satan's temptation to disobey God and eat of the forbidden fruit. In so doing, they rejected God's covenant with them and brought about the inherited sinful condition upon all mankind.
Because of their sin, death came upon them and all mankind. Their sin (and ours, too) prevented any hope of improvement, redemption, or reconciliation back to God. Hopeless and helpless, their future offered one certainty, death, God's promised judgment.
God could have left them to their consequences in lawful justice. He had warned them of the result of their disobedience. He had no obligation to do otherwise than to execute judgement upon them.
Instead, the Creator revealed other attributes of His nature. Not only was He holy and just. He was gracious and merciful, too. In His meeting with satan, Adam, and Eve after their sin, God not only revealed His glorious grace and mercy, but His omniscience, omnipotence, and sovereignty as well.
He announced to Adam and Eve His plan for the redemption of sinners. He stated in Genesis 3:15:
"And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel."
Thus began the revelation of God's provision for sin and sinners, Jesus Christ.
A thorough exposition of this passage would identify many truths concerning the Promised One. However, I will comment on only three of them. They provide the basic fundamental doctrines of Jesus Christ. The failure to emphasize them creates a doctrinal vacuum in the Church of Jesus Christ today. This void contributes significantly to the Church's spiritual decay. Therefore, a renewed emphasis upon these truths will help spur believers to seek spiritual revival.