Sorry I've only read half this thread but felt I needed to say this. The reasons I believe it is a cult.
The GB are a small group of men who claim to be God's spokesperson (the Faithful and Discreet Slave) that is ALWAYS being referred to in their literature. If anyone speaks against them they can be disfellowshipped which means they can have no contact with their family whatsoever. A person is looked down on, 'marked', if they don't preach, don't go to all the meetings or other such things. A woman can't wear trousers to a meeting or out in the 'minisrty', a man cannot have a beard (if he does he's looked down on). A person cannot celebrate any holiday, or else they are disfellowshipped. Any sexual indiscretion is brought before three elders who have to go into every tiny detail, if a person is deemed unrepentant, they are disfellowshipped. You cannot smoke, take drugs, get drunk, etc.. if you do are brought before the 3 elders, who can disfellowship you. You cannot openly disagree with ANY of their teachings, or you can be disfellowshipped. If you behave in a way that is deemed 'spiritually weak' you will be marked. If you are disfellowshipped, you will be shunned. Obeying the 'Organisation' is tantamount to obeying God. There is no freedom... to think, behave or talk about.. everything you say, think or do is controlled. if you try and get away it's almost impossible.... your family is held to ransom.
There are many other reasons but these are off the top of my head. Is it a religion... yes... but in my mind it's also a cult.