John saw another angel (v.1) bringing an important message that Babylon the great (the whore) is fallen (v.2). Compare this description with Jeremiah 50:39; Isaiah 21:9; 14:23 and 13:21. There is a very strong comparison between the fall of the old Mesopotamian Babylon city and spiritual Babylon the great, the city of Rome. The fall of Babylon has been already declared (Revelation 16:19 and 17:16) but now it is completed. Verse 2 also signifies that the Papacy, Vatican city (and the Roman Catholic Church) has become the habitation of every foul spirit. The false church has made alliances with the nations of the world for commerce and political power, which is signifies by their fornication with the false church (v.3).
Then the Apostle John hears a voice (v.4) calling God’s people to “come out of her.” “Her” is the Romish Church. Be not a partaker of her sins! As God once had a captive people in the old Mesopotamian Babylon, so He also has people in spiritual Babylon. From the time of the Reformation God has been calling His people to come out of her. It cannot be doubted that He has many true and earnest believers inside the Roman Church or at least those seeking the truth of the true living God. The invitation is given to the people of God yet in captivity, lest by remaining they should be involved in her destruction.
They should not to be involved in the ecumenical movement promoted by the Vatican, to so-called ‘unite’ all under one world religion. Their plan for unity between Catholics, Orthodox, Anglicans and protestants is, “The only true road to unity was for all to admit their errors and return to Rome.” False prophets, like Billy Graham, Rick Warren and others in the so-called modern evangelical churches promote this dangerous idea of joining with the Roman Catholics as if they are just another Christian denomination. They are in opposition to true faith. Thus I believe these protestant and evangelical pastors are collectively described in the “false prophet” of this revelation.