All I know is that, without adding to, taking away from or twisting the words, what 'the serpent' told them would happen, happened (according to the bible itself). God said that if they ate the fruit, they would die. The serpent said if they ate the fruit, they would become as gods knowing good and evil, vs5. A few verses later, vs22, god confirms that serpent was right. god was the false prophet and the serpent told the truth.

One of the functions of a culture's mythology is aetiology, that is explaining why certain things are the way they are. Another is to explain their people's (usually supposed) history, but that's a story for another day.
One of the reasons for the garden of eden myth is to explain why snakes, in contrast to other creatures, doesn't have legs.
Christians have hijacked the story for theological purposes, quite at odds with its original intent. I was pointing out the absurdity of making the story a theological statement.
I want dialogue with christians. Maybe, just maybe, I can help them along in their rejection of christian doctrine and beliefs.

In the Talmudic version of the story and in Josephus' retelling, the "serpent" not snake, walked on two legs like a man and had arms and hands. He was basically a velociraptor.
The serpent was also very knowledgeable but had no wisdom, Eve had wisdom but no knowledge, the serpent wanted to know what would happen to one who had both, so used eve as an experiment. What happened was they A & E immediately started shagging like rabbits and so stopped being immortal as they had to make way for all the little new people, hence death being brought in to the world.
When god saw this had happened he sent Adam and Eve out in the world to populate it, and cut off the arms and legs of the serpent creating the first snake in the shape of a phallus so he would always know what his sin was.

No where in any version of the myth is the serpent said to be, or be working for Satan he is just a wylie creature with too much curiosity for his own good.

Good question

It was in the wrong place at the wrong time.

It morphed into Adam's dick and Eve couldn't help but suck it. Hey, it's the bible. Did you expect a logical answer.

If you are looking for logic and fairness in the Bible, you are going to be sadly disappointed.