What does Revelation 12 teach about the origin of evil?

In Revelation 12, the narrative unfolds revealing the cosmic battle between good and evil, illustrating how Satan, represented as a great red dragon, sought to devour the male child, symbolizing Christ. This chapter explains that the conflict between God and Satan has a historical basis, going back to the fall of Lucifer, who was cast out of heaven due to his pride and rebellion against God. The chapter also portrays the struggle of the church, the woman, as she gives birth to the male child, highlighting the ongoing battle the faithful endure against the dragon. The decree of God allows for this evil, serving both as a test of faith for believers and an ultimate demonstration of God's sovereignty.