I believe God only wants us to know that which He gives the Holy Spirit to reveal to us in His word as we study the scriptures.
Angels are essentially “ministering spirits,” (Hebrews 1:14) and do not have physical bodies like humans. Jesus declared that “a spirit hath not flesh and bones, as ye see me have” (Luke 24:37-39).
The Bible classifies some angels as “elect” (1 Timothy 5:21) or “holy” (Matthew 25:31; Mark 8:38). All angels were created to be holy, enjoying the presence of God (Matthew 18:10) and the beauty of heaven (Mark 13:32).
Other angels oppose God under the leadership of Satan (Isaiah 14:12-20) whom even Satan is a created spirit of God that is why God could never destroy him because a spirit can not die. (Matthew 25:41; 2 Peter 2:4; Jude 1: 6; Ephesians 6:12). We often call these types of angels demons for which an everlasting fire is prepared by God for these angels, Matthew 25:41; Rev 20:10.
As long as Jesus is sitting at the right hand of God, Satan still has limited access to the heavenly realm of God accusing the brethren before Him as Jesus makes intercession for us, Rev 12:10. Until Satan's final judgement he is still the prince of this world, John 14:30, and still has restricted access to the heavenly realm as we read in 2 Chronicles 18:18-21 and Job 1:6, 7, until the war in heaven towards the end of days between Michael and his angels and Satan and his angels when Satan will have no more access to the heavenly realm and will be cast into the lake of fire, never to reign terror on God's children anymore.
The name Satan comes from a Hebrew word sah-TAHN which means adversary as in signifying an enemy, and an accuser, father of lies.
Satan was created perfect in all his ways with beauty, wisdom and freewill. God placed him as one of the two guardian cherubs covering the atonement cover of the ark in the tabernacle of God in heaven. He was entrusted with many possessions and found much favor in the Lord, Ezekiel 28:14, 15. The physical Tabernacle or Sanctuary in Jerusalem was patterned after the heavenly Tabernacle of God in heaven, Hebrews 9:1-5, 23,24; Exodus 25:17-22; 1 Kings 6:19-28. These scriptures describe the cherubim in the earthly Temple patterned after the heavenly. Ezekiel 28:12-15 identifies an angelic being who is called the anointed cherub who covers and he was on the holy mountain of God. We can only assume that Lucifer/Satan was one of the cherubs by the description in those scripture.
God created the earth and saw that it was good and he took Lucifer from Gods Holy Mountain and set him over the Garden of Eden as a covering cherub to watch over and enjoy all that was of God. As Lucifer was set in the garden iniquity was soon found in him as he defiled Gods sanctuary through pride in his own beauty and deceit as he wanted all that was of Gods here on earth to be his own as he tried to make his throne above the angels and be God.
Because iniquity was found in him God cast him and those angels who chose to follow him out of his holy mountain and cast them all down to earth to be trampled of all nations. The only reference in scripture that denotes there being one third of the angels falling with Satan is in Revelation 12:9.
(Ref: Read Ezekiel Chapter 28 Prince of Tyrus – another dual referent)
