I've never understood what could have caused Satan and his angels to rebel against and reject God.
my view
First God Had a Plan before He created this earth and all in it -----His Plan from the beginning was to Send His Only Son to shed His Blood and die on a Cross and be resurrected to rescue mankind from eternal damnation ----this is important to know because without Lucifer having a name change to Satan ---there would have been no reason for God to send His only Son to Save mankind ------
God created everything perfect even human kind -----He then gives His human creation the freedom to make choices ----if Lucifer had of Stayed Lucifer ----all would have remained perfect ----all of God's Human creation would have remained in full obedience and fellowship with Him ---- there would have been No fall of humans or this world -----
God Is an all knowing God ----so God already knew before He even started His plan that when He created His angels that He would give them free will to choose to serve Him or not -----He knew which angels would be His elect and which ones would rebel against Him -----
Lucifer was a Cherubim angel according to scripture ----Ezekiel 28: gives you that ====
this is from ---read all for yourselves
https://www.versebyverseministry.org/bible-answers/what-does-the-bible-say-about-angels
Cherubim are creatures that guard God’s glory and serve Him in various ways including at His throne and temple.
Seraphim are higher than angels and
Cherubim are higher than seraphim.
Before his fall, Lucifer (Satan) was the highest cherub and therefore the most power angelic being of all.
I say
So God allowed Lucifer to choose to become prideful and Have his name Changed to Satan ----God's allowed other angels to follow Satan -----just like God allowed Pharaoh's heart to remain hardened towards freeing God's people ------God leaves us to our own devices -----God does not force anyone to accept him ---he wants us to choose to follow Him through our Love for Him ------
God needed an adversary for us to be able to have free choice --------
Satan was still welcomed by God at certain times ----like with Job ----Satan can do nothing on His own he has to have God's permission to tempt people ------
I say ----------This scripture seems to indicate that Satan was in heaven talking with God at the time he was given permission to harass Job -----
Job 1
Satan Attacks Job's Health
2 Again
there was a day when the sons of God came to present themselves before the Lord, and Satan also came among them to present himself before the Lord.
I say -----God's plan had to include a Satan --Without A Satan ----- we all would be living in a perfect world with------- NO--- wars ---sickness --disease ---temptation ----evil -----unbelief -----etc --etc --etc
Free choice would have been nil as we would only have God's way to follow -------we would have been in perfect fellowship with God forever -- until He decided to Rapture us all up ----like He did with Elijah and Enoch ----
So Satan was necessary for God's plan to work as He wanted from the start ------and to the finish -----
We can choose Who we follow and where we go in our end -------