Genesis 3: 1: Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
Before the Serpent was changed into a reptile (Genesis 3: 14), he was originally an upright creature and was somewhat between a chimpanzee and a man, but more closely resembled a man. The Bible classifies the Serpent as being of the beasts of the field, which further establishes the point that he was not a reptile to begin with, and because he surpassed all other creatures in subtilty, his position as head of the animal kingdom was unquestionable. Although pure animal, the Serpent looked very much like a man and was able to reason and talk; even his seed could and would mix with that of Adam’s wife and cause her to conceive.
There is a definite affinity that exists between man and beast. To prove this, when the embryo cells from an unborn animal fetus are injected into a human being, those cells will go to exactly the right spot. The thyroid cells will go to the human thyroid, and the kidney cells will go to the human kidneys etcetera. It is because there is an intelligence that accepts those cells and guides them to the right place. Although getting them to intermingle and reproduce has been tried before, it does not detract from the truth that in the Garden of Eden the intermingling did take place. God destroyed the pattern of the Serpent (by changing him into a reptile) after Satan had taken advantage of his physical characteristics to beguile Eve. No other beast can commingle with man, although the affinity remains.
Because Satan does not have creative power, the only way for him to get into the stream of human beings was to enter the Serpent in Eden. Satan could not have a child directly by Eve (as did God by Mary), so he entered into the Serpent and then beguiled Eve. In using the Serpent to seduce Eve, Satan had a child vicariously. The child (Cain) bore the full spiritual characteristics of Satan and the animalistic (sensual, fleshly) characteristics of the Serpent.
Satan incarnated the Serpent to fulfil his vow of becoming like the Most High (Isaiah 14: 14). Having seen how God brought forth a son in Adam, Satan needed a son too, but he could not achieve that by using the female Serpent on Adam, for Adam could not be deceived (1 Timothy 2: 14), and because it would have led to a child that was the son of Adam, and not the Son of Satan. Furthermore, we learn that Lucifer as the greatest of the angels was God’s deputy in Heaven, and the Serpent as the greatest of the beasts was in a sense an assistant to Adam on the earth. But when Lucifer fell and set about to bring the fall of human beings, he made use of the Serpent, because the Serpent mirrored on the earth the position that Lucifer once held in Heaven.
So as not to alarm Eve, Satan presented himself to her in the form of an animal that was slightly inferior to man and subject to man, for Adam had been given dominion over the animal kingdom in Genesis 1: 28. Unbeknown to Eve, the Serpent as the highest animal had been incarnated by the highest Devil (Satan). To make the setting even more alarming, the Serpent was a pre-Adamite specie (having been made on the sixth day before Adam was put into flesh) that seduced a post-Adamite specie (Eve was made after Adam). Satan successfully mixed the genetics of the Serpent and Adam’s wife to form his own hybrid specie.
Today science can try all it wants to, but it will never find the missing link between man and beast. Man is smart and can see that there is an association of man with animal, and tries to prove that association with the theory of evolution. Their assumption of a missing link is correct however, but God saw to it that the link vanished off the face of the earth when He changed the Serpent from a beast into a snake.