We know there is only suppositions that Satan was probably the "snake", but nothing solid proves this. However many times, even today, we say "that bitch slapped me", or that "dirty rat" hit me on the head... and so forth, neither of which assume we are speaking of a dog or a rat respectively.
There is no reason ignore this of the "snake" in Eden, as no scripture says otherwise. Keep in mind there are many things "cultural that are left out when books of the Bible were written. We may say "I drove to the grocery store", yet what is the word "drove?" How fast? etc.. But we leave that out in the paper, because it is obvious. This may be true of the Serpent.
Further more you can see there is a hint in Gen 3:14, that whoever/whatever Eve was conversing with, was already UPRIGHT - standing, or flying if we are dealing with Nephilim. God cursed "it" to the ground on "its" belly. To eat dirt for the rest of "its" life.
so it is quite possible that the dirty rat conned Eve. I have not found any scripture that says This is Satan, Are the churches teaching it literal? If so why?