When it comes to “slandering,” you may want to point to something official, not something you say you heard.
My pleasure, Alice!
"One thing hard for many people today to understand is that there can be and there is only one true religion. Why do they rebel against such fact? It is because all other religions are false, and this would include their own religion."
(The Coming Deliverance From the Anti-Religious "Ax", Watchtower January 15, 1976, page 47)
"...As JEHOVAH'S WITNESSES, we testify that:
(1) WE ABHOR the reproach that Babylon the Great, and Christendom in particular, has cast on the name of the one true and living God...
(2) WE ABHOR Christendom's adherence to Babylonish teachings...
(3) WE ABHOR anti-God philosophies and practices, so common in Christendom...
(4) WE ABHOR Christendom's failure to heed Jesus' messages...
(5) WE ABHOR the immorality and permissiveness in Christendom and among its clergy...those who continue in their filth--fornicators, liars and suchlike--will be utterly destroyed...
(6) WE ABHOR the centuries-old spiritual prostitution of the clergy of Babylon the Great in conniving with worldly rulers...
(7) WE ABHOR the massive bloodguilt...largely attributable to the great harlot's fornication with the political powers. WE REJOICE that the appointed time is near for God to execute judicial punishment on Babylon the Great..."
("A RESOLUTION", Watchower April 15, 1989, pages 18-19)
There are many more, just look in your CDs or bound volumes!