Revelation 12:7-9 . . .battled 8 but it did not prevail, neither was a place found for them any longer in heaven. 9 So down the great dragon was hurled, the original serpent, the one called Devil and Satan, who is misleading the entire inhabited earth; he was hurled down to the earth, and his angels were hurled down with him.
2 Peter 2:4 4 Certainly if God did not hold back from punishing the angels that sinned, but, by throwing them into Tar′ta‧rus, delivered them to pits of dense darkness to be reserved for judgment;
Revelation 16:13-14 13 And I saw three unclean inspired expressions [that looked] like frogs come out of the mouth of the dragon and out of the mouth of the wild beast and out of the mouth of the false prophet. 14 They are, in fact, expressions inspired by demons and perform signs, and they go forth to the kings of the entire inhabited earth, to gather them together to the war of the great day of God the Almighty.
From the above scriptures, it may be understood clearly that satan has angels who serve him, these are fallen angels, and Peter also tells us of angels who sinned. In Rev 16 we see these angels are called demons.
Jesus shows us this also here:
Matthew 8:28-31 28 When he got to the other side, into the country of the Gad‧a‧renes′, there met him two demon-possessed men coming out from among the memorial tombs, unusually fierce, so that nobody had the courage to pass by on that road. 29 And, look! they screamed, saying: “What have we to do with you, Son of God? Did you come here to torment us before the appointed time?” 30 But a long way off from them a herd of many swine was at pasture. 31 So the demons began to entreat him, saying: “If you expel us, send us forth into the herd of swine.. . .
Clearly, these demons knew who Jesus was and thought he had come to punish them before their time. These demons are fallen angels who sinned in various manners.
I know this may not be what is said in your teachings, but this is what we believe.