I'm not seeing where it says the serpent is the head or covering of Adam.
I did not say it says that directly. It's something that has to be seen by gathering various passages together.
Adam doesn't necessarily mean "man". Depending on the context, it is a direct reference to a specific man,, i.e. "the man, Adam" etc.
Look up the meaning of the word adam. Don't take my word for it, and it may help sort things out. The reason the title "Son of Man" is important is because it means Jesus was in the correct image and likeness of God which had been given to Adam (Man). Jews understood it and it made them angry since they knew what he was claiming.
Genesis 1:1 (KJV)
Enowsh or Enos means "mortal man" -- less spiritual than adam.
Genesis 1:1 (KJV)
Draw a comparison to the children of Abraham. Some were his children after the flesh; but they were not his children by the spirit. Abraham had two sons but God told him to take his only son. "Take now thy son, thine only son Isaac, whom thou lovest, and get thee into the land of Moriah. . . ." Ishamael was his son after the flesh but not after the spirit. His mother was still a pagan at the time. She converted later; but she was still under the "wrong covering" when Ishmael was conceived.
The correct "image and likeness of God" given to Adam had been lost. Some holy men repaired it in part; but it was not perfectly restored until the Holy Spirit covered Mary -- and the seed of the imperfect fallen Adam was not transmitted by an earthly father.
Why would God ask the serpent to sacrifice himself when Christ's sacrifice was sufficient?
You got what I said reversed. I did not say Christ sacrificed himself and then God asked the serpent to. I said perhaps if the serpent had sacrificed himself, Jesus wouldn't have needed to correct things and then offer himself.
I wasn't suggesting that Adam was deceived.
You wrote "both" and I didn't know what that meant.
The fool says in their heart that there is no God, but they don't have to do that through deception. They can just as easily do it through their own unrighteousness.
I'd connect the two. Their unrighteousness is what convinces them in their hearts. They wish there were not a God who will judge them, so they imagine a universe without one so they sin all they want because there isn't a God looking at them.
Psalm 14:1 The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good.
I'm pointing out that he was there with Eve, and sinned. He's just as guilty as she was, if not more so Given that he not only wasn't deceived, but allowed Eve to be deceived while he stood there, and then sinned intentionally knowing that what he was doing was wrong.
I think maybe the serpent was guilty before he met Eve. He was given a final chance to repent and do the right thing but didn't.
Why was he there? So Adam could exercise authority by telling him if he stayed in his fallen state, he'd get rid of him.
I don't know if I'd use the word "sin" for Adam, Eve or the serpent. "Transgressed" maybe, "made a mistake" yes, but I'd be cautious about saying Adam and Eve or even the serpent sinned since Genesis doesn't say so. Cain sinned. Genesis says so. That is the first time sin is mentioned in the Bible. I'm not saying they didn't sin, but I also wouldn't say they did since I'm not sure they did. I don't know, so I hesitate to use the word.