There is nothing in the old testament to say that the snake is Satan.
That was introduced in the 2nd edit.
What part of the Bible was Job, and what part of the Bible was Ezekiel?
Who was the 'covering cherub in Eden' of Ezekiel 28vs13-15 ?
Although the word serpent is not used the connection to Satan is made.
Remember that original serpent was just a tool in the hands of another.
A super human could easily use the serpent as a ventriloquist uses his dummy.