Yes, Adam and eve was tempted by the serpent to eat from the tree of knowledge between good and evil. But is this a temptation to sin? Is it not good to have knowledge between good and evil? What wickedness did the serpent commit, what evil, by giving man the knowledge between good and evil? Was it not man's choice to choose evil over good?
Before hand man did not have knowledge between good and evil--that does not mean that they were not committing good and evil. It is just symbolic that the serpent became a teacher of good and evil. It was not a temptation to sin, but a temptation to see as the gods do. What evil is there in looking through the eyes of the gods--wouldn't that be most desireable to man?
You say the serpent is evil, No, the serpent is not evil; but a teacher of knowledge--that through knowledge; as spoken in the bible--the first adam was given a living-soul and the last adam was a quickening spirit. How from the first Adam could the last Adam become a quickening spirit unless he has knowledge between good and evil? Without the knowledge between good and evil, the holy spirit which is the last Adam could never have come into being. Now, you tell me what evil the serpent has committed.
I do not deny that Satan does not exist. According to theology, Satan was the accuser of the great council--the rebel angel. Does that necessarily make him evil? No, Satan just had a differing opinion or philosophy. Satan is the great tempter, however, in his temptation he restores desire and provides knowlege of the body; rather than the spirit. And you say that since he provides knowlege of the body--that he is the bringer of sin. But does not wisdom first seek the mind and then fall to the body?
Even Jesus Christ said, in scripture, sin is the child of wisdom and wisdom always goes to her children. Those who are virginly pure do not have knowlege of the body and therefore have no sin, neither do they have wisdom. Like I said, Lady wisdom always goes to her children which are those who the virgins and saints call sinners.
The serpent or the dragon or reptile has always been symbolic to embodiment of infernal wisdom.