I seem to recall that the Jw evidence for this is very thin on the ground. They take one phrase about the "bride and bridegroom"never being heard again, and say that shows it must mean christidom. But thats one line out of an entire stream of discription that quite frankly could be about anything. If it was Christindom then why not write somthing about them not being able to seek god through BTG anymore etc??? I mean the writer gos to great lengths to discribe the aspects of this babylon the great, why not discribe what Christidom actualy does?
Feel free to correct me if you like. I just remember quickly scanning that swathe of scriptures to find that one line to show "see that means its the churches of the world!"