In the garden account the idea of a serpent speaking to Eve sounds unbelievable but we learn in the Bible that demon spirits enter into humans and we read in the Bible in one case they went into pigs, so we know demons can enter into living beings.
How else was Satan to appear to the woman but to inhabit a living creature and he chose the serpent.
In the Revelation Satan is referred to as the Dragon. The garden was a unique place where no other humans inhabited except for Adam and Eve who God created so Satan’s only alternative was to inhabit a non human living creature. Notice that the woman had no fear of the snake and this was because she was in her pre DNA changed state and didn’t feel fear until after they ate the fruit.
Genesis 3:22 Then the Lord God said, behold the man has become like one of Us, to know good and evil. And now lest he put out his hand and also take of the tree of life, and eat and live forever. Satan changed the DNA of humans and imparted his seed via the fruit of the tree that Adam and Eve ate.
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