The witlesses are becoming more a cult. Perhaps they were just another offshoot of Christianity when they started. But, they trended toward being a cult, more so when Boozerford was at the top. He is the one that started the ban on Christmas and in using the cross. Gradually, they started doing more things to cut themselves off from the world.
These days, they are getting worse. In the past several years, they have cracked down on college (like they did in 1969, but this time they are threatening "privileges" if parents allow their children to attend college). They are banning independent research (cracking down once in the early 1980s, and again with the September 2007 Kingdumb Misery). They bust up families unless all members believe in the Filthful and Disgraceful Slavebugger. They lie to the courts to give the impression that their children live normal lives, and then they make the same children waste all their time in field circus.
And, starting in 2008, the Washtowel rag split into two. Prior to that, both were for the public (they placed both in field circus). Starting with 2008, they place the edited version for the public (that's why I would advise extreme caution before concluding that they are mainstreaming based on a Showcase Washtowel or Asleep article). The other edition is the Kool-Aid edition, with material that the public is not supposed to see. This frequently contradicts the doctrines in the Showcase Washtowel or the Asleep!.
Which is enough to call it a cult.