My claim is that there is no verse in the Book of Revelation that speaks or predicts or even suggests or hints "about how corrupt Christianity will become and how it will be replaced by a new song, or religion."
Verses from Revelation 21
Sin is a form of corruption and arguably in a Biblical sense sin is corruption and the corrupt will be dealt with.
7 Those who are victorious will inherit all this, and I will be their God and they will be my children.
8 But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars—they will be consigned to the fiery lake of burning sulfur. This is the second death.”
A new song or religion.
1 Then I saw “a new heaven and a new earth,” for the first heaven and the first earth had passed away, and there was no longer any sea.
2 I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband.
3 And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them. They will be his people, and God himself will be with them and be their God.
4 ‘He will wipe every tear from their eyes. There will be no more death’ or mourning or crying or pain, for the old order of things has passed away.”
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I suspect that I'm wasting my time because you will find a way of saying that in your mind that this does not speak of how corrupt Christianity will become and does not speak of a new song or religion.
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