"And he said, 'Who told you that you were naked? Have you eaten from the tree that I commanded you not to eat from?' The man said, 'The woman you put here with me - she gave me some fruit from the tree, and I ate it.' Then the Lord God said to the woman, 'What is this you have done?' The woman said, 'The serpent deceived me, and I ate." NIV translation
In this passage, we get to see a conversation between God, Adam, & Eve. We see that Adam & Eve's answer to why they disobeyed God was to point the finger at others. Adam points the finger at God Himself for providing the woman and the woman for causing him to sin. The woman blames the serpent instead of taking responsibility. The simple fact of the matter is that they were both presented with a choice and they both chose to disobey God. We cannot be too hard in our judgment of them because many times we do the same thing. Instead of simply admitting that we have sinned and resting in God's grace, we often will try to justify our actions and blame them on others. We also give Satan (the serpent) too much credit and power instead of relying on the sanctifying work of the Holy Spirit in us.
"So the Lord said to the serpent, 'Because you have done this, "Cursed are you above all of the livestock and all the wild animals! You will crawl on your belly and you will eat dust all the days of your life. 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."'" NIV translation
Sin had its penalty for all that were involved. For the serpent (snake), it meant being cursed forever and evidently this snake had legs before it was sentenced to crawl on its belly. This judgment also contains the prophecy of the coming of Jesus Christ as it describes the seed of the woman crushing the head of the serpent.
That was accomplished with the crucifixion and resurrection of Jesus Christ as He defeated sin, Satan (the head of the serpent), and death. We also see that Satan (the serpent) is able to strike at the feet of man and this speaks to the fact that he will try to make you stumble in your walk with the Lord. But, we can rest assured in the power of Jesus Christ to preserve us with His care.