My opinion is this: there was no serpent to temp Adam or Eve.
The story narrative simply explains, in simple children's terms, the differences between two opposing values: Good and evil.
Adam an Eve were gifted with the ability to reason, to make choices.
The test by which that is determined is the making of the right choices, based on what is good and or what is evil.
How would they know which was which?
When it is said that God told Adam that of all the trees in the garden, one of them in particular, they could not eat of. The day he did, he would surely die.
That was the inner voice of the Spirit of God, or better understood as the moral conscience.
The moral conscience is the "Adam" in the "Eve". Explained: Spirit breath of God (Adam) into the clay, earthen vessel, "Eve".
A marriage between heaven and earth resulting in a living soul.
Gen_5:2 Male and female created he them; and blessed them, and called their name Adam, in the day when they were created.
Since both male and female are both called "Adam" in the singular, defines both as possessing a spirit and flesh in the same body or, in other words, a living souls.
Adam, being the spirit and moral guidance of the human body "Eve" reflects the superior quality of the human being; be it male or female.
While Eve, being the clay vessel , earthen origin, reflects the weaker partner of the human being, be it male or female.
That is why there is no gender difference in Gods eyes.
Getting back to the "presence of Satan" in the garden.
The fleshly world is the playing field by which all human temptation is derived from.
1Jn_2:16 For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
Reasoning then is, that Satan is of the world and lusting after things of the world...... defiles us.
Blessings, AJ