Now the serpent was more crafty than any beast of the field that the LORD God had made. And he said to the woman, “Did God really say, ‘You must not eat from any tree in the garden?’ ”
The woman answered the serpent, “We may eat the fruit of the trees of the garden, but about the fruit of the tree in the middle of the garden, God has said, ‘You must not eat of it or touch it, or you will die.’ ”
Gen 3:1-2
Reading the "serpent" in Genesis as a literal snake is probably a simplistic reduction. The word also appears in The Book of Enoch. I don't think it's referencing "snakes" there either.
"Gabriel, one of the Holy Angels, who is in charge of the Serpents, and the Garden, and the Cherubim."
Enoch 20:7
I believe there is also more to the word "satan" than most realize. The word means adversary or accuser.
In Job, the Hebrew text uses the definite article "ha-" with the word "satan". This literally translates to "the adversary" or "the accuser". Some translations render the text in Job as "the satan". Many biblical scholars argue this is a "title" or a "job description" and not a proper name.
Also note this. In addition to "the satan", there were other "sons of God" that came "to present themselves before the LORD" (Job 1:6).
In the Book of Enoch, Satan is sometimes used in the singular:
"And Michael, and Gabriel, and Raphael, and Phanuel shall take hold of them on that great day, and cast them on that day into the burning furnace, that the Lord of Spirits may take vengeance on them for their unrighteousness in becoming subject to Satan and leading astray those who dwell on the earth."
Enoch 54:6
And sometimes it's used in the plural:
"And I heard the fourth voice fending off the satans and forbidding them to come before the Lord of Spirits to accuse them who dwell on the earth."
Enoch 40:7
