Yes, all the demons know, in the same sense as an informed reader of the Bible knows. They don’t know in the same way God knows: with perfect understanding and infallible sight.
When Jesus confronted some demons, they said, “What have we to do with You, Jesus, You Son of God? Have You come here to torment us before the time?” (Matthew 8:29). They knew what their ending is going to be. Torment.
Of the devil, it is said, “Therefore rejoice, O heavens, and you who dwell in them! Woe to the inhabitants of the earth and the sea! For the devil has come down to you, having great wrath, because he knows that he has a short time.” The devils know the future and it is not good. They are going into the pit to be tortured forever because of their unforgivable sin of exalting themselves above God.
Satan knows his own future. But he cannot tell the future by his own power. He knows the future the same way the serious student of the Word knows–because the Bible tells us what is going to happen. Satan knows the Bible; I wish more church-goers knew it as well.
