So...the beast is "sin"?
Actually it's Antichrist:
Rev. 13:1 The beast has 10 horns and seven heads. The ten horns and seven heads of the beast are those of the dragon of Rev. 12:3, indicating that the beast is one with the dragon, Satan. The ten horns are the ten coming kings from Rev. 17:12 and Dan. 7:24. The seven heads are the seven Caesars of Rev. 17:10. The ten horns correspond with the ten toes of the great image mentioned in Dan. 2:42-44. The word here indicates that the Roman Empire, Antichrist, and the ten kings are one with Satan.
Rev 13:2 The beast is like a leopard, having the feet of a bear and the mouth of a lion. The interpretation in Daniel 7 gives us an idea of what these aspects of the beast represent: In type the leopard is swift and cruel, which represents the greatest king of the Greek Empire Alexander the Great (who conquered the Persian empire). The bear, with it's massive crushing paws is the symbol of the Medo-Perisan Empire. The lion represents king Nebuchadnezzar of Babylon. These three aspects represent the totality of all the evil powers in human history.
The number of the beast - AntiChrist- in Rev. 13:18 is the number of a man. This is Caesar Nero, who at the time of John's writing "was and is not" (Rev. 17:8). If you take "Caesar Nero" and correspond the letters with both the Greek and Hebrew alphabets (the two primary languages in which the Bible was written) you get 666. That the beast is Caesar Nero also corresponds with the items mentioned in Rev. 17 pertaining to him: He has seven heads, representing the seven hills upon which Rome was built (and also the seven Caesars), and the ten horns representing ten kings indicates that during the Tribulation period ten kings will be raised up in the revived Roman Empire. These also correspond with the ten toes of the great image Nebuchadnezzar saw in Dan. 2:41-42.
The word 'anti' means: against; in opposition of.
The number of a man is Adam because he was created on the 6th day of creation. So Adams number is "6". Check out the Hebrew Gematria. 666 represents an infinite number of mankind committing sins/abominations here on earth.
Caesar Nero was an antichrist, so were the Pharisees, so were the Sadducees, Hitler was too, Saddam Hussein is an anti christ.....so is everyone who blatantly goes out an sins or doesn't believe Jesus is the Messiah who died for our sins and resurrected on the 3rd day. When God said "Thou shalt not murder" and you go out and commit murder, you are in fact an antichrist!
Sin spreads rapidly just like a leopard, Sin devours and tramples down just like a bear, Sin goes into destruction and speaks blasphemy just like the lion. PLEASE READ Ephesians 2:1,2 Titus 1:16 and 1 Peter 5:8
Not to mention, you may want to read Revelation 22:11 very carefully.
Perhaps you should read Isaiah 14 about Nebuchadnezzar or Ezekiel 28 about the Prince of Tyrus. Better yet, read how Satan entered into Judas Iscariot.
You keep wanting to point the finger at Rome, when Rome wasn't even a Christian nation when Revelations was written. Rome didn't become Christian until Constantine in 312AD. Revelations was written in 95AD. The Roman Empire split up and the Muslims took control of most of the land that Rome controlled. Muhammad conquered Jerusalem in 638AD. Constantinople is in modern day Turkey now overrun by Muslims. Check out your history. When you read the book of Revelations, read it with the mindset of 95AD.
The 7 heads are Egypt, Babylon, Assyria, MedoPersia, Greece, Rome and the Islamic Empire.
Egypt, Babylon, Assyria, MedoPersia, Greece are the 5 that have fallen. The 1 is during that time was Rome. The other not yet come (sorry Nero died in 68ad) is the Islamic Empire. Since this beast (kingdom) is OF ALL of them, they ALL have a common factor......SIN.
Pay attention to Rev 13:9,10.