After failing to devour the Messiah in Revelation 12, the dragon now fights against all people who entrust their lives to Jesus.
The devil wants to prevent God from fulfilling His promises. However, there will always be people who are not controlled by the devil and who do not rebel against God and His order.
Revelation 12:11 describes how the devil is defeated by appealing to the blood of Jesus – His substitutionary death – by standing with God and no longer being forced by threats of death.