This is how, in my walk at this point, I have been given to understand the opponent and adversary.
The adversary, the serpent, the devil, and the dragon are our enemy. Man fights the enemy with spiritual warfare. We are instructed, after being called by the Father to His Son Jesus, and are re-born of the Spirit, to be aware of this enemy. Because the enemy is a spirit with powers allotted to its existence, to war as a roaring lion, a thief and a murderer, seeking whom it may devour.
Dust is the main meal, we are that dust, man is the quarry. Man was formed with spiritual weakness, for God's purpose, mans basic instinct is to disobey, miss the mark, man can not help himself. The enemy a spirit, and has been given the power and the ability to infiltrate the mind (where emotions have their beginnings) and work its (bad)spiritual abilities.
I reason that when mans mind was awakened by the voice of the enchanter, the prognosticator( a predictor) and when Gen 3:6 And, when the woman saw…" the work of the enemy began. The adversary as the serpent enchants, as the devil(traducer) one that exposes to shame or blame by means of falsehood and misrepresentation.
The dragon is in the sea(mass of humans) its in the rivers, which I reason are channels that are used to infiltrate.
We as souls re-generated born from above have been given power(dunamis) to overcome the enemy when we HEAR. Jesus said He did nothing of Himself, it had to come from the Father. So it is with us, that power to overcome only can be used when we HEAR from our elder brother.
The enemy exists and is to be reckoned with.