May I ask - what, apart, perhaps, form traditional Christian philosophy, leads you to believe that evil is synonomous with sin? I ask, becuase, the scriptual citiation you give ceratinly describes the account of the first sin, but I am unclear as to your reference for this being the first 'evil'??? In either case here, I see a potential dilema with modern Christian doctrine - and I'm not saying that's bad (or good) . . . it is what it is . . .
Logically, if Adam's is the first 'sin' and the first 'evil', then we must admit that: 1) Satan did not yet exist (or was still quite the 'good guy') prior to Adam - he was performing his appointed task by tempting Eve in the Garden (God's directed Will - neither sinning or doing evil); or 2) Satan was NOT the serpent in the Garden.
I wouldn't recommend ditching scripture and its meaning to replace it with the idea that evil doesn't result from sin.
Honestly, who in their right mind, the Mind of Christ, would say that the first sin wasn't the first evil?? How can anyone justify that?
Evil is the transgression of God's Word. When did that first evil sin occur EVER?
(Gen 3:6) And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
Why did she do this?
Because of the "LUST" within her that she didn't overcome with the Word of the Lord. Here is that exact same lust defined;
(2Pe 1:4) Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
Why do we lust?
(1Jn 2:16) For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
It is our way. It is being "worldly". It is how we were created;
He created us vain and self serving;
(Rom 8:20) For the creature was made subject to vanity, not willingly, but by reason of him who hath subjected the same in hope,
Why?
"In Hope".
(2Co 4:7) But we have this treasure in earthen vessels, that the excellency of the power may be of God, and not of us.
Sin is an evil act. That is where evil comes from. As a result of the act.
To be tempted isn't evil. Nobody would argue that I hope. Jesus was tempted to sin but He wasn't evil of course. He didn't sin, therefore righteousness is exhibited.
What Christian doesn't know that evil is the act of sin after being tempted!? Honestly? And how many scriptures will clarify that?
NO scripture will suggest that evil exists apart or "before" sin.
It is certainly ignoble to suggest that, as Adam and Eve did, we are to try to "logic" it out with our insufficient carnal minds of the tree of "knowledge of good and evil". Let's let God tell us, then believe it, then receive enlightenment. He is quite plain and clear about it.
It is silly to say evil existed before sin. THAT sure doesn't come from the Lord. The first sin was the first evil act and it was disobedience to God's spoken Word by Adam. No "reasoning" needed here. Let's not attempt to slice and dice the word of God up until it matches our inventions.
It is an important thing to know who and how sin and evil came into the world. Was it by Adam? Or someone else?
The "subtle serpent of the beasts of the field" can easily be identified in scripture. Just ask, "who are the beasts of the field" in scripture? (For those who don't know, check out one hint in Acts where Peter saw a sheet descending from heaven 3 times full of them...Compare Acts 10:12,13... to Acts 10:34,35. Read that scripture again. Or another hint in Hosea 2:18... or... )
The scriptures I cited are clear to me. But they don't include all that extra stuff I've been seeing here about some super spook running around being "evil" prior to Adam's temptation. That is bad business to say such things. It is paganism and mysticism and demonology.
If there is any lack of misunderstanding in this, we should examine our "tradional christian philosophy" and dump it for the word of God .
WHO would possibly imagine otherwise than God's Word? Everyone.
That is why we need it and should go by it.
Anything else is supposition, tradition and "logic", which will decieve and destroy.
Fact. Whoever that self serving person was who produced a beguiling word to eve, it wasn't anyone special. He was just a "beast of the field which the Lord God created". He wasn't under any "law" for none had been given until God spoke the first commandment into existence;
(Rom 3:20) Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
Sin didn't exist until after the first law was given, which was, "thou shalt not eat..." in the garden.
(Rom 3:20) Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
(Rom 7:7) What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
By this Law we know we are corrupt, corruption brings forth evil;
(Mat 7:17) Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
We are naturally corrupt and sinful and bring forth evil because we are Adam's offspring;
(Rom 5:12) Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
(Rom 5:13) (For until the law sin was in the world: but sin is not imputed when there is no law.
(Rom 5:14) Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come.
Out of the heart of MAN is where evil comes from;
(Mat 15:19) For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
So who was the "person" from which the first evil came into existence?
Adam.
Who is the person NOW who tempts us? As above, our own lusts of the flesh, lusts of the eyes and the pride of life.
Now we all know "who" satan is.
And Jesus destroyed His tempter;
(Heb 2:14) Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
Now He is destroying my devil/sin/evil/satan.
Praise the Name of Jesus 
Blessings