He walks around, as a "roaring lion" looking for those whom he can take advantage of, capture, and defeat. He is always on the prowl for those whom he can destroy.  But he is not all that he presents himself as. He is a fraud. He has been found to be a liar. He has been cast down, and expelled from the presence of God Almighty. Yet believers are "fearful" of our enemy, the Devil. Jesus Christ faced him off, and Jesus Christ was NOT afraid nor moved by the Devil (Satan).

Jesus Christ DEAFETED Satan the Devil !

1 Peter 5:8

Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour