Some people interpret scripture and say that Babylon is code for Rome and that the whore of Babylon is the Catholic Church...
In order to not leave people confused, Id just call Rome Rome and not Babylon.
Instead of describing the Beast as a leopard with seven heads, Id just say "it's the Pope"!
No Babylon is Babel. It is own place. Although it could also be indicative of any place offering salvation not through Christ. This was what the tower of babel was made for, to reach heaven without God, but on mans terms alone. Which is why God confused their tongues (divided them up into seperate languages) and cast them out. Anyways,
Although I have rolled around the thought if the Catholic Church being the whore of babylon mentioned in revelations. I say this with no certainity as it is just a personal theory.
Revelations 17
17 And there came one of the seven angels which had the seven vials, and talked with me, saying unto me, Come hither; I will shew unto thee the judgment of the great whore that sitteth upon many waters:
2 With whom the kings of the earth have committed fornication, and the inhabitants of the earth have been made drunk with the wine of her fornication.
3 So he carried me away in the spirit into the wilderness: and I saw a woman sit upon a scarlet coloured beast, full of names of blasphemy, having seven heads and ten horns.
4 And the woman was arrayed in purple and scarlet colour, and decked with gold and precious stones and pearls, having a golden cup in her hand full of abominations and filthiness of her fornication:
5 And upon her forehead was a name written, Mystery, Babylon The Great, The Mother Of Harlots And Abominations Of The Earth.
6 And I saw the woman drunken with the blood of the saints, and with the blood of the martyrs of Jesus: and when I saw her, I wondered with great admiration.
7 And the angel said unto me, Wherefore didst thou marvel? I will tell thee the mystery of the woman, and of the beast that carrieth her, which hath the seven heads and ten horns.
8 The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder, whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is.
9 And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth.
10 And there are seven kings: five are fallen, and one is, and the other is not yet come; and when he cometh, he must continue a short space.
11 And the beast that was, and is not, even he is the eighth, and is of the seven, and goeth into perdition.
12 And the ten horns which thou sawest are ten kings, which have received no kingdom as yet; but receive power as kings one hour with the beast.
13 These have one mind, and shall give their power and strength unto the beast.
14 These shall make war with the Lamb, and the Lamb shall overcome them: for he is Lord of lords, and King of kings: and they that are with him are called, and chosen, and faithful.
15 And he saith unto me, The waters which thou sawest, where the whore sitteth, are peoples, and multitudes, and nations, and tongues.
16 And the ten horns which thou sawest upon the beast, these shall hate the whore, and shall make her desolate and naked, and shall eat her flesh, and burn her with fire.
17 For God hath put in their hearts to fulfil his will, and to agree, and give their kingdom unto the beast, until the words of God shall be fulfilled.
18 And the woman which thou sawest is that great city, which reigneth over the kings of the earth.
Take into account the 7 churches of the apocalypse here.
Seven churches of Asia - Wikipedia
One could say that the seven heads of the beast are representative of the seven churches of apocalypse. The 7 churches is misleading though because what means is 7 schools of thought about christianity. Jesus only approved of 2 of the schools of thought for churches and that is the church of Smyrna and the church of Philadelphia. There other 5 make up the vast majority of protestant churches which of course all split from Catholicism. So a case can be made for the Whore of Bablyon to actually be the Catholic Church.