How did God intend to redeem man and save him from his sin?

In Genesis 3:9, God asked Adam: "Where art thou?" How did Adam answer? "...I heard thy voice in the garden, and I was afraid, because I was naked..." (verse 10). That's a rather strange response, because verse 7 says: "...and they sewed fig leaves together, and made themselves aprons." They made a covering of fig leaves to hide their nakedness. The fact that Adam admitted he was naked reveals that he recognized the insufficiency of covering his nakedness with the fig leaves. Later, in verse 21, we read: "Unto Adam also and to his wife did the LORD God make coats of skins, and clothed them."

Important to add is that not only was man's fellowship with God broken by sin, but so was the perfect marriage. Verse 20 says: "And Adam called his wife's name Eve...." Genesis 5:2 says that God called both man and woman by one name: "Male and female created he them; and blessed them, and called their name Adam, in the day when they were created."

God confronted Adam and asked: "Hast thou eaten of the tree...?" Adam blamed his wife: "The woman whom thou gavest to be with me." God asked Eve, "What is this that thou hast done?" Adam pointed an accusing finger at Eve, and she passed the blame to the serpent: "The serpent beguiled me and I did eat." God takes every one seriously. He requires an answer from each of us, so He turned to the serpent and said, "...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" (Genesis 3:15). This was God's first promise of redemption for mankind: "...and her seed; it shall bruise thy head...." In other words, salvation was to come. God had a plan right from the beginning: He would redeem fallen man, thereby restoring perfect fellowship. Thus, in the first pages of the Bible, God makes it clear that the power through which He will redeem mankind will not be by the seed of man, but by the seed of the woman. This is the first indication as to how God intended to redeem mankind, which had fallen hopelessly into sin and had become subject to Satan.