Genesis 3:15 "And I [God] will put enmity between thee [Satan] and the woman [Eve], and between thy seed [the Kenites] and her Seed [Jesus Christ]; It [Christ] shall bruise thy [Satan's] head, and thou [Satan] shalt bruise His [Christ's] heel."
Jesus Christ will bruise the head of Satan, at Christ's second advent; while it was Satan's children, the Kenites, his seed (the Kenite Jews) and not our brother Judah (the Israelite Jews), that bruised the heel of our Lord on the cross. This was done when the spikes were driven through Christ's heel, as He hung on the cross to pay the full price for our sins, once and for all. Most men of God recognize that this verse is talking about the death of Jesus Christ, when He was nailed to the cross for our sins.
They also recognize that "seed" as used here is talking about children of the woman Eve. Yet somehow they like to spiritualize away the rest of the verse, and every thing else that happened in the Garden of Eden between Eve and the two men, Adam and Satan. "Seed" in the Hebrew is called "zirmah", and in the Greek text it is "sperma". We in the English tongue call it sperm, and in Strong's Hebrew dictionary #2233; "Posterity, carnally, child, fruitful". It can't be any clearer, The seed of Satan's posterity are the Kenites, the children of Cain, while Adam's posterity is in Christ, and of the pure pedigree bloodline through Seth.
Not until you understand what really took place in the Garden of Eden, and why; will you be able to fully grow up and mature in the Word of God, and in true Christianity. Eve's Seed is our Lord Jesus Christ, while Satan's seed to the last generation are called the Kenites. They are the offspring that came through Cain, the first murderer, and those Kenites are the ones that sealed their father Satan's destruction when they plotted the killing and went through with Christ's death.
John 8:44 Ye are of your father the devil (Cain through Satan), and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
We are also told in 1 John 3:12 that Satan is Cain's father. 1 John 3:12 Not as Cain, who was of that wicked one, and killed his brother...
God's plan was that Christ would be crucified, whereby the rest of us would have salvation through the blood of God's only Begotten Son. That's right, from the very beginning of this earth age God's plan was to have His only begotten Son Jesus Christ born into the world in a flesh and blood body, just as you and I have. Then live the perfect life in that flesh and blood body and be crucified by Satan's own offspring the Kenites, and after three days, rise from the dead. Every event of Jesus' birth, life and death are well recorded through prophecy, including what He would be doing while in the grave and after His resurrection, as we read above.
Hebrews 2:14 "Forasmuch then as the children (we) are partakers of flesh and blood, He also Himself (Jesus Christ) likewise took part of the same; that through death (on the cross) He might destroy him (Satan) that had the power of death, that is, the devil."
This is why Jesus will be addressing Satan, while talking to Peter, for it is Satan that is putting the words through Peter's mouth.
Mark 8:31 And he began to teach them, that the Son of man must suffer many things, and be rejected of the elders, and of the chief priests, and scribes, and be killed, and after three days rise again. 32 And he spake that saying openly. And Peter took him, and began to rebuke him.
Peter’s first thought was, ‘we are not going to allow this to happen’.
Mark 8:33 "But when He had turned about and looked on His disciples, He rebuked Peter, saying, "Get thee behind Me, Satan: for thou savourest not the things that be of God, but the things that be of men."
Jesus is reminding Peter that he keeps wanting to pick the feelings of men and their traditions over God’s plan to save the world of their sins. This act of protection of Christ, after he knew what the plan of God was, was from the devil. Those ideas dealing with the things that go against the Word of God, being taught in church societies come directly from the leaven, and fragments that are picked up while walking amongst the multitudes after the feeding of the truths. Jesus is saying that if I tell you something is going to happen, it is going to happen exactly as I have told you it will no matter what your church picks up from the fragments on earlier teaching.
This question can be asked of you and me living today. If you know exactly what the events of our day are going to be, why would you allow Satan to come in and cause you to question any part of those promises? This is like the clay telling the potter how it wants to be formed. Peter has been told what must happen, and the first thing that he thinks he should do is change God's plan..
This is exactly what is happening today, many churches are telling people how to be in God’s good graces and what to think through their church traditions and false doctrines. They promise their church systems, rather than giving the straight forward Word of God. However, there are many good teachers also, and when you sit under one of them you are fortunate. The point here then is to think in the Spirit according to the Word of God, and not by your flesh nature, when your thoughts go against the Word of God. Beware of the leaven of the doctrines of men.