ANSWER: The Bible describes angels as created beings (Psalm 148: 2, 5), powerful (Psalm 103: 20), and in form they are spirit (Hebrews 1:14). There is no known way to detect the presence or movement of angels. This does not make them any less real. Humans are limited to see them unless angels either open our eyes or they appear in human likeness. Before being battled out of heaven, Satan was known as Lucifer, the covering cherub (Isaiah 14:12). His position was in the very throne room of heaven. God gave him great responsibilities.
Satan is ultimately responsible for sin. He is demonic and ultimately hardened in sin. At some stage he passed the point of no return in his rebellion against God. He knows what fate awaits him and is emblazoned in his goal of robbing everyone on earth of their inheritance in Christ. He wants millions upon millions to share the same fate that he knows is coming to him. The Bible reveals that “everlasting fire, [is] prepared for the devil and his angels.” Matthew 25:41.
There is one reference in Scripture that describes the execution of Satan. This text also is an example of what the Bible means by the term “everlasting fire.” It is a fire with eternal results, not eternal in duration. You be the judge!
By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire.
Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee. Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffic; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee. All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more. (emphasis added)