They believe only JW's will be saved because they're more of a cult than a religion because of their exclusivity teaching of salvation. Saying you don't need to be a JW is something of a fallacy cos their teaching is that only those doing what JW's do are going to be saved.... which are JW's obviously
They claim exclusivity in doing a preaching work but there were missionaries from other religions all round the world hundreds of years before the WTS was set up. The preaching of the 'good news of the kingdom' was the only pre-requisite in the bible and not of the old hebrew god YHWH.
Interesting article Blondie. I might be wrong but didn't the org change their policy on the faithful and discreet slave doing the marking from the secretary's inkhorn? Also that the preaching work wasn't 'marking' people for destruction or salvation?
I can't look things up at the moment cos my main PC is being repaired so my memory could be wrong.