See, what I was taught in catechism was that God was talking to Satan himself. Not to the serpent, but to satan in the serpents form.
Of course, us rebellious Lutherans are known for stirring things up a bit.
lol, I just reread the chapter, and the use of serpent is in the context that the serpent is satan. I can see where people would misconstrue the serpent part meaning God was actually talking to a snake. I think the context of the chapter is denoting that God was (again) talking to satan and referring to him as a "serpent".