Mystery Babylon is an End-Time religious and economic power-house that will align with the Antichrist. She is the greatest source of false religion and idolatry ever devised. She will reign over the kings of the earth. The Bible warns God’s people to “come out of her.”
Revelation 18:4-5 4 Then I heard another voice from heaven say: "Come out of her, my people, so that you will not share in her sins, so that you will not receive any of her plagues; 5 for her sins are piled up to heaven, and God has remembered her crimes.
For this reason, it is important for believers to identify this end-times city/state. The Bible gives us a long list of specific characteristics that she will have. Many different cities have been suggested over the years; Rome, The Catholic church, Babylon in Iraq, the United Nations, Jerusalem, New York, and the list goes on. Today, Mecca/Saudi Arabia seems to fit all the scriptural requirements of the harlot Babylon.