I believe the Genesis account of Eve and then Adam sinning is true and real, but that the Serpent is a personification for the Satan/Devil/ that Revelation 12:9 reveals are the same entity. The Serpent from old, goes back as far as the serpent with which Eve has a conversation.
The style of writing of the story or Eve, is in line with the style of the story of Jesus's temptation by Satan, the story of Job and the tragedies in Job's life caused by Satan. As in many other instances in the Bible the literary use of personification is used. Once is is understood that Satan has been personified and in the three stories mentioned above, we should see that this entity of Satan, is an apparent character but is really something else that is not a person or a supernatural person.
What then is the Satan/Devil/Serpent? The three can be thought of as aspects of the same entity. The Satan, is the opposer or adversary; the Devil is all that represents evil works and actions; the Serpent is the deceiver and liar.
The answer to what this entity is given by James (James 1:13,14) and by Jesus Mat 15:16 And Jesus said, Are ye also yet without understanding?
Mat 15:17 Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?
Mat 15:18 But those things which proceed out of the mouth come forth from the heart; and they defile the man.
Mat 15:19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
Mat 15:20 These are the things which defile a man: but to eat with unwashen hands defileth not a man.
Jeremaiah also confirms that the heart/mind is the most deceptive of all; Jer_17:9 The heart is deceitful above all things, and desperately wicked: who can know it?
God knows what is in all our hearts/minds and will see in us the out-workings of the carnal mind which is part of our human nature which in the case of Jesus, we overcame and won the victory. Paul writes; (Rom 8:7) Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be
Based on all the above, the conclusion I have come to is that the Serpent with which Eve has a conversation is personified to represent the thoughts and reasoning going on in Eve's mind as to why she should not eat the forbidden fruit that she desired to eat. Her selfish desire became the outworking of that part of her nature and mind that is referred to as "carnal". This then means that when God curses the serpent, it is the carnal mind that is cursed.
We see the victory Jesus won over the carnal mind, and because of his victory and resurrection in the form of an immortal nature, the same as will be given to all those resurrected, everyone in God's kingdom will be totally righteous. Death and the cause (sin) will have been totally destroyed (symbolically in the Lake of Fire as described on Revelation. In God's kingdom, all the righteous will have the law (the two Great Commandments) written in their hearts/minds such that only doing good will be the natural order of that time. That is when God will dwell with man and God will have the relationship with righteous man, that God had intended from the beginning and has a plan to make possible.
I hope what I have shown above gives truth and light to those who seek it.