My thoughts are pretty much the same as yours. It's somethig I've tried arguing myself.
I like using this image (or some variation of) to illustrate the point more:
In the bible God has a much bigger taste for blood than Satan, Satan is viewed as evil because he wishes to corrupt humans, have them think for themselves and defy God. God denies them knowledge of ignorance and obedience.
To offer a Satanic perspective of this, I think these lyrics offer an interesting representation of the the forbidden fruit story.
Reconcile not with the fear of the snake
But embrace it as your own
Inject its venom into your veins
And replant the seed that gives growth
Still shrouded in mystery
Until you arise above perception
A veil of ignorance is in motion
Continuing throughout generations
(A veil of ignorance is in motion
Continuing throughout multiple generations
Let me be the one that deliver you from the deceit
And back into perfect accordance with the laws of nature)
The snake is notoriously tempting
But the snake is fair
What is worse than not knowing
to live or disappear?
From it we can see that Satan is fair and wishes to break the ignorance of man and to overcome the deceit of God and to embrace their natural state. The forbidden fruit is knowledge. What God expects of his believers is ignorance. It might explain why so many Christians are ignorant of any knowledge thrown their way, because they have blind faith in their God and the reality he had given them. The don't question that, because it is the way of Satan, who continuously finds himself defiant of God's ways.
The band members are LaVeyan Satanists (to put the lyrics in context), which is a sect that believes that knowledge is important and considers ignorance to be a sin. It promotes individualism and free thought and when you consider their virtues, they actually seem a lot less cruel than Christianity. But I would say it does have things we'd consider to be bad. I see a lot of woo in the Satanic bible, but I don't think the woo is necessarily taken seriously, at least, not by all.
From a statement from their leader of the Church of Satan, Peter Gilmore:
Satanists do not believe in the supernatural, in neither God nor the Devil. To the Satanist, he is his own God. Satan is a symbol of Man living as his prideful, carnal nature dictates. The reality behind Satan is simply the dark evolutionary force of entropy that permeates all of nature and provides the drive for survival and propagation inherent in all living things. Satan is not a conscious entity to be worshipped, rather a reservoir of power inside each human to be tapped at will. Thus any concept of sacrifice is rejected as a Christian aberration—in Satanism there’s no deity to which one can sacrifice
So on the other hand we instead of this view of Satan not as some evil entity seeking to wreak havoc and do all sorts of evil things, we have him as being human desire, or basically, our id. What's natural, our instincts. God always seeks to control mankind in the bible, God always tries to repress these things we'd consider to be natural emotions, heck, the 7 deadly sins are human emotions: lust, gluttony, greed, sloth, wrath, envy, pride. Homosexuality is considered a sin, even thought it's complete natural. Sex is natural, but it's only considered okay when it's for pro-creation and the couple are married under the sanctity of the Lord.
My conclusion? Satan wants humans to be human, God wants them to be obey.
However, these are just biblical interpretations. I prefer the idea of Satan being the guy rooting on freedom and God being the evil dictator, because it's exactly what it'd be if we put them into a human context. But alas, we ourselves, do not have the magic decoder ring. Could be much of the bible represents an internal struggle of the human psyche - the fight between the id and the ego, but we could never truly know.