Tempt people toward immorality (Matthew 4:1-11)
Disseminate false doctrine (2 Thess. 2:2; 1 Tim. 4:1; 1 John 4:1-3; cf. 2 Cor. 11:14-15)
Oppose the life and ministry of believers (Rom. 8:38-39; Eph 6:12)
Encourage idolatry (1 Cor. 10:20; Rev. 9:20; cf. 2 Thess 2:3, 4, 9).
Influence human governments (Dan. 10:13-20; Eph. 6:12).
Work in opposition to unfallen angels (Dan. 10:12-13).