The idea that a spirit can speak through an animal, is evident in Numbers 22-24 when Baalum had a conversation with his donkey on whether it was right and just to curse the Jews.
The serpent as Omega Vision pointed out, may have just been a serpent (what type of serpent is irrelevant). What is relevant is that a spirit (Satan's spirit) spoke through the serpent, and beguiled Eve.
Back to the pertinence of this thread, and it's opening statement, or question. According to scripture, unless a person repents of their sins, believes in their heart that Christ is their savior, and is baptized in Christ's name, they shall not have eternal life. now these are not my words, but words that were written in the bible.
According to scripture, the Jews used to perform animal sacrifices to atone for sin, and the bible says that God used to wink at those things, but that his spirit will one day cease to strive with man.
The Old Testament was how God used to deal with man. Jesus was born into this world to show man the path to salvation, and the way to get there.
So if the only way to become a child of God, is to be baptized, then what does this say about those who choose or chose not to be? Who's children are they? Certainly not Gods.
I can fully believe in the concept that not some people were born to go to hell, but that all people were born to go to hell, as they were born of sin, and shaped in iniquity. This is further backed by scripture, when it states that man has a dual nature. What are the two natures that scripture speaks of? Well we have Gods nature, and Satans nature.
Is there a such thing as legalism in Christianity? Of course there is. How can I say this? Well, the fact that a person must be baptized is just the tip of the iceberg. It also states that a person should be blameless in the sights of man, and therefore he/she can not be found guilty of fault. The bible says that Satan went to and fro seeking out whom he might destroy. Hmmm, let's think of how he did this. In Job, Satan approached a celestial assembly in which God sat with his sons (the angels) and asked God if he could kill Job. God answered no. Had Job been guilty of wickedness, the answer may have likely been different.
In the Old Testament, there was no such thing of men/women receiving the Holy Ghost/Spirit, and it dwelling within them. The spirit of God, was said to inspire people in the old times, but never was there an indwelling of his spirit until Christ died, and was resurrected.
Jesus said: "I will pray to the Father, and he will send a comforter (Holy Ghost/Spirit) in my name". Who's name? Jesus' name. So I am convinced that the Holy Spirit is in fact the Spirit of Christ, according to scripture.
There came a day, that the Pharisee's came before Jesus, and before they uttered one word, Jesus told them that "If they destroy this temple that "He" would raise it back up in three days. They laughed at him and said that how could he raise a temple in three days that took a many many months to build. Jesus was talking about his body, and not the synagogue, that he stood beside. Let me clarify something. The bible later said that God raised Jesus from the dead in three days. Hold on a second, if Jesus said that he would raise himself up in three days, was it God speaking through him, or was Jesus God? The mystery of the trinity?
I'll leave off with this. In the beginning was the Word, and the Word was with God, and the Word was God. The Word dwelled with man, and they knew Him not.