Scripture does not record the exact date in which Adam and Eve revolted against their Creator. It is reasonable to conclude this event occurred after the 7th day of history, after Satan's rebellion, but well before the 130th year of history (Genesis 5:3 records Adam was 130 years old when he became the father of of Seth). After Satan rebelled, he went to the earth where he made his attempt to convince humanity to join him— to join him in his rejection of God.
In Genesis 3, Satan is referred to as the serpent (see Revelation 13:9 for further confirmation of this). Various passages throughout Scripture indicate that demonic beings are capable of possessing both humans and animals (see Matthew 8:32 for the account of the demon possessed pigs). In the Garden of Eden, Satan was not only capable of possessing the snake, but was also able to speak through it.
Now the serpent was more crafty than any other beast of the field that the LORD God had made. He said to the woman, "Did God actually say, 'You shall not eat of any tree in the garden'?" (Genesis 3:1 ESV). The way in which Satan posed this question shows that he was seeking for Eve to reject both the wisdom and integrity of God. The woman said to the serpent, "From the fruit of the trees of the garden we may eat; but from the fruit of the tree which is in the middle of the garden, God has said, 'You shall not eat from it or touch it, or you will die'" (Genesis 3:2-3). Eve's response shows that she knew exactly what God had commanded, she was not in ignorance.
The serpent said to the woman, "You surely will not die! "For God knows that in the day you eat from it your eyes will be opened, and you will be like God, knowing good and evil" (Genesis 3:4-5). It is at this point that the fall of humanity occurred. When the woman saw that the tree was good for food, and that it was a delight to the eyes, and that the tree was desirable to make one wise, she took from its fruit and ate; and she gave also to her husband with her, and he ate (Genesis 3:6). Eve was attracted to the Satan's lies instead of God's truth. She planned her rebellion, stepped forward, and ate of the fruit in hopes of becoming like God. She saw sin as sweet and shared in the delight with her husband.
But the sweetness lasted only for a short time. Then the eyes of both of them were opened, and they knew that they were naked; and they sewed fig leaves together and made themselves loin coverings (Genesis 3:7). Evil was injected into the human race for the first time and shame followed. However, Adam and Eve did not repent. Instead, they tried to hide from their Creator.
The Fall: No Repentance - The Christian Worldview
How Bad Is Sin? - The Christian Worldview
Man In the Image of Man - Genesis 5:3
The Fall: Merciful Curses - The Christian Worldview
The First Marriage - The Christian Worldview