There is a bible verse that describes him as a liar and a murderer from the beginning, it will be amongst these, see the link:-
https://www.kingjamesbibleonline.org/Bible-Verses-About-Devil/
How this is explained is in this link:-
http://www.truefreethinker.com/articles/was-devil-%E2%80%9Cmurderer-beginning%E2%80%9D
I've read the bible a number of times but am no expert on it.
1 Peter 5:8
"Be alert and of sober mind. Your enemy the devil prowls around like a roaring lion looking for someone to devour"
God is depicted as the creator of all things - Isaiah 45:7
"I form the light, and create darkness: I make peace, and create evil: I the Lord do all these things."
If this concept of God creates evil yet uses Lucifer (Satan) as a way to propagate evil amongst the world, who would be truly responsible for evil?
In the Bible Satan Kills 10 people, while God is in the several millions that He kills.
Satan wanted to be seated above God the sin of pride.
I found this site that may give you some information.
There also some "related topics" at the bottom of the page that you can follow up on.
There is a bible verse in 2 Corinthians 4:4 which says: Among whom the god of this system of things has blinded the minds of the unbelievers, so that the illumination of the glorious good news about the Christ, who is the image of God, might not shine through.
There are many quotes in The Lord Of The Rings that purport to show that Sauron is evil.
So, there are two positions from the analogy above(at least) to consider here.
Either Satan is evil, or the delusional writers of the bible made him evil because they needed an antagonist to magic man.
Then again the bible is not only the writings of ignorant desert savages it is also about as much a work of fiction ( see the magic parts/made up parts) as The Lord Of the Rings. Not as well written either!
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