This false teaching tries to dismiss the fact that the Bible declares that there is a very real spiritual being called Satan, who is the devil (Greek diabolos). The name Satan means adversary and deceiver. Many claim that the devil is just an idea, a concept, a myth or a fairy tale. But here’s an analogy to help you understand this point: we don’t have to know where the Law of Gravity came from, or even need to understand it fully, in order to know that it is very real indeed, and that there are dire consequences for ignoring it. The same goes for Satan.
It is interesting to note that in the documented exchange between Satan and Eve (Genesis 3:1-19) in the Garden of Eden, Satan uses his tried and true tactic (which he still uses today) of deliberately twisting God’s Word with the intent to deceive and to spiritually/eternally kill all of the human race which was being born. Satan does this by either adding to, subtly altering, or taking away from God’s Word. This is why a Christian is strongly admonished to know the Word of God for themselves, so they are not deceived.
The Bible doesn’t tell us exactly when Satan was created, but it does say that he is a very real created spiritual being, an angel. As a created being, he is therefore not omniscient (all knowing), omnipresent (able to be everywhere at once) or impotent (all powerful). And it tells us that he “prowls around like a roaring lion, seeking someone to devour” (1 Peter 5:8). So yes, Satan exists, and he means to destroy you – to kill you eternally. He tries to do this by obfuscating the truth of Scripture, by telling lies, half-truths, and distorting (mis-quoting) Scripture. He is the father of lies. Below is an excerpt from Beyond the Tomb: 
Sometime, not clearly revealed to us, some “angels sinned,” “kept not their first estate, but left their own habitation,” and are reserved in “chains of darkness unto the judgment of the great day” (2 Peter 2:4; Jude 6). It is generally believed that Satan and his hosts of demons are the ones referred to. Satan is called the “prince of devils” (Matthew 9:34), “prince of the power of the air” (Ephesians 2:2), “ruler of the darkness of this world” (Ephesians 6:12), and the “power of darkness” (Colossians 1:13; Ephesians 6:12).
He then has a kingdom, has a dominion, and reigns. From Matthew 25:41 we infer that hell was “prepared for the devil and his angels.” Then demons are angels, and of course must be fallen angels [also called unclean spirits]. Knowing their final doom, James tells us they “believe and tremble” (James 2:19) This is evident from what the demons said to Jesus: “And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? Art thou come hither to torment us before the time?” (Matthew 8:29).
So, there are good, holy angels in heaven, and there are evil, fallen angels in hell. The good are “ministering spirits, sent out to render service for the sake of those who will inherit salvation.” (Hebrews 1:14) The evil ones are under the direction and rulership of Satan and are sent forth to destroy the souls of men.
Satan opposes everything good and of God. His main weapon today is deception. The false teachings in this section of the book are of his doing, as he attempts to deceive people out of believing in God, in the Bible, in Christ, and then even after they are born again, to try to cause them to stumble and fall away from the faith, backslide, go apostate or be lured out of the straight and narrow path to eternal life and back into bondage under sin to eternal death.
The popular rendition of him as a fanciful cartoon character with horns in red tights and a pitch fork is woefully off the mark and designed again to deceive you into dismissing and underestimating the fact that he is a very real being, and that he means your eternal death. The forces of evil are in a battle with the forces of God and good, and this world is the battleground. We as Christians are on the front line in a spiritual war, with Satan and the angels who sinned on one side, and God and His holy angels and saints on the other side. Do not make the mistake of underestimating Satan, nor make the mistake of pretending he doesn’t exist. Both mistakes can lead you to eternal death.
 Riggle, H.M. (1929/2018), Beyond the Tomb, (The Gospel Trumpet Company/Holy Spirit Prints).