Pike says there are 80 instances in which Israel is characterized as an imperious whore of Babylon and denounced as a harlot or lewd woman.
In Apocalypse 17 and 18, the Whore of Babylon is the woman who sold her soul to the world. This is spiritual adultery and the very reason Israel of the OT was given the title of "whore" by God Himself, as Hosea 2:2-13 says,
Israel is justly punished for leaving
 Say ye to your brethren: You are my people, and to your sister: Thou hast obtained mercy.  Judge your mother, judge her: because she is not my wife, and I am not her husband. Let her put away her harlotry from her face, and her adulteries from between her breasts.  Lest I strip her naked, and set her as in the day that she was born: and I will make her as a wilderness, and will set her as a land that none can pass through, and will kill her with drought.  And I will not have mercy on her children: for they are the children of fornications.  For their mother hath committed fornication, she that conceived them is covered with shame: for she said: I will go after my lovers, that give me my bread, and my water, my wool, and my flax, my oil, and my drink.
 Wherefore behold I will hedge up thy way with thorns, and I will stop it up with a wall, and she shall not find her paths.  And she shall follow after her lovers, and shall not overtake them: and she shall seek them, and shall not find, and she shall say: I will go, and return to my first husband, because it was better with me then, than now.  And she did not know that I gave her corn and wine, and oil, and multiplied her silver, and gold, which they have used in the service of Baal.  Therefore will I return, and take away my corn in its season, and my wine in its season, and I will set at liberty my wool, and my flax, which covered her disgrace.  And now I will lay open her lewdness in the eyes of her lovers: and no man shall deliver her out of my hand:
 And I will cause all her mirth to cease, her solemnities, her new moons, her sabbaths, and all her festival times.  And I will destroy her vines, and her fig trees, of which she said: These are my rewards, which my lovers have given me: and I will make her as a forest, and the beasts of the field shall devour her.  And I will visit upon her the days of Baalim, to whom she burnt incense, and decked herself out with her earrings, and with her jewels, and went after her lovers, and forgot me, saith the Lord.
and then Jeremias 3:6-9 says the same thing...
 And the Lord said to me in the days of king Josias: Hast thou seen what rebellious Israel hast done? she hath gone out of herself upon every high mountain, and under every green tree, and hath played the harlot there.  And when she had done all these things, I said: Return to me, and she did not return. And her treacherous sister Juda saw,  That because the rebellious Israel had played the harlot, I had put her away, and had given her a bill of divorce: yet her treacherous sister Juda was not afraid, but went and played the harlot also herself.  And by the facility of her fornication she defiled the land, and played the harlot with stones and with stocks.
Notice verse 8, the divorce....
Pike first describes the spiritual marriage of God with His spiritual bride Israel...
This .....allegory tells how God rescued Israel from death as a rejected infant and chose her for His spiritual bride –......... in the desert of Sinai. There God entered the covenant of spiritual marriage with His bride. But that happiness was so brief!
[Israel] you trusted in your beauty and played the harlot because of your fame and poured out your harlotry on every passer-by who might be willing… (Ezekiel 16:15).
From Moses through the prophets, Israel is repeatedly characterized as a whore. .....Isaiah and the other pre-exilic prophets aimed their wrath at Jerusalem: “How the faithful city has become a harlot!" (Isaiah 1:21) Isaiah denounced apostate Jews as “sons of a sorceress, offspring of an adulterer and a prostitute” (Isaiah 57:3).
Israel rejected Jesus Christ, her Messiah. She has never yet repented. This compels an inevitable conclusion: Israel of today and tomorrow is the same symbolic woman once chosen as God’s unique bride but ultimately divorced and cast away because of her spiritual adultery.Israel is that “Mother of Harlots” John saw on the beast of Revelation 17 and 18.
Then Pike drives the point home saying:
Israel was the first to marry God (Christ) and be spiritually one with Him. Thus the position she enjoyed as a spiritual bride was unique to her. Likewise, only apostate Israel can be the “mother” of spiritual whoredom. When she was chosen as Christ’s bride, other nations were disobedient like a child to its parent. Only Israel was made capable of a wife’s infidelity. As a result, when she became a spiritual whore, she was indelibly marked, “Mother of Harlots.” Jeremiah said, “You had a harlot's forehead, you refused to be ashamed.” (Jer. 3:3)
Quoting KFC Kickin For Christ,
Nowhere in scripture is Israel ever referred to as Babylon. Zion. Yes. Babylon. Never.
Isaias 3:16-26, describes Sion in trouble with God, it's a poetic judgment against the Whore.
Very similiar concepts appear in Lamentations 1:1-10 mentions Sion and Jerusalem that are also in the lament of the whore of Babylon in Rev. 17 and 18.
6 And from the daughter of Sion all her beauty is departed: her princes are become like rams that find no pastures: and they are gone away without strength before the face of the pursuer. ...................... Jerusalem hath grievously sinned, therefore is she become unstable: all that honoured her have despised her, because they have seen her shame: but she sighed and turned backward.  Her filthiness is on her feet, and she hath not remembered her end: she is wonderfully cast down......