"The Jews didn't associate evil with Satan. The Christians do. The roots of that are in the 'deuterocanonical' books. Judaism considers Satan a loyal and obedient servaht of God. Ihe is portrayed that way in the OT."
Jesus is the one who identified the devil as Satan in Matt. 4 during the temptation and taught the disciples that Satan was the enemy, the accuser. He identified Satan as Lucifer of Ezekiel 28 and Isaiah 14 when He said He saw him fall from heaven Luke 10:18. He prayed that god would keep Peter from the evil one. It was not the apocrypjal books that taught the disciples; it was Jesus. In fact, there is only one obscure quote from the apocryphal books in the whole bible and that by Jude concerning someone named Enoch. All the other books are mentioned with authority, but Enoch is not cited as scripture. It is mentioned in passing as Paul did with the pagan poets and philosophers.
"Judaism considers Satan a loyal and obedient servaht of God. Ihe is portrayed that way in the OT"
That's not what 1 Chron. 21:1, Job 1:6, 12, Psalms 109:6 and Zech. 3:2 say. Satan is considered the adversary provoking David, Job and Israel and the Lord rebukes him.
In Job, Satan (ha-satan) is identified as one of the angels (sons of God) on two occasions. His job was to accuse and disrupt, to tempt so that, as Judaism explains it, man can make choices.
Finally, you'll have to take the issue up with Judaims. They emphatically deny that Satan is a fallen angel, that angles can rebel,or have free will, and emphatically assert that as far as Judaims is concerned Satan is a loyal angel of God.
Nowhere in the OT is there any connection made between Satan and Lucifer or satan and the 'devils" (as KJV calles them), or demons.
You also must take into consideration that Jewish demonology and anegology was notshared by the priestly caste of Sadducees who believed neither, and whose Canon was the Five Books of Moses.