Apostacy is the falling away or departure from the truth of Christ. This is the working of satan which is already at work 2 Thessalonians 2:7. The falling away is systemized in a worldly religious system that Christ calls the great harlot, Mystery Babylon. Which rides on satan the fiery beast. The power, the direction and the working of this system is planned and actualized from hell. People in the church are unaware but blindly follow. They never know the system that they are in or know their spiritual state which is wretched , miserable and blind and naked Revelation 3:17. The Lord of this system ,god of this world will continue to control this system. Revelation 17:3-4 the system rides on satan and we need to have our eyes opened that we may see the filth of this religious system and our desolate state spiritual and seek the truth.