When we become children of God, through faith in Jesus Christ, He becomes the wall that shields us from the enemy of our souls.
The tactic that the enemy employs to defeat the Christians or even those who are getting close to salvation is by getting them to be afraid of something. Once a person gives in to that, they are doomed. The devil will say that God cannot help you, and only his solution can.
All deception originated from Satan, who is the father of lies (John 8:44). The word “dragon” in the Book of Revelation identifies it as Satan, the one who will give the antichrist and the false prophet their power (Revelation 13:4, 14).
The serpent is the one who caused mankind to fall into sin by deception and brought about their death, physical and spiritual—separation from God.