A cult is a religion that is said to be unorthodox or that emphasizes devotion according to prescribed ritual. Many cults follow a living human leader. Often they live in groups seperated from society.
Jehovah’s Witnesses however, strictly adhere to the Bible. They have no human leader, nor do they isolate themselves society. To them, their worship is a way of life, not a ritual devotion. They live and work in the community.
The only way anyone is going to get the full facts of what Jehovah's Witnesses believe is to get the information from the "horse's mouth", their official website gives you all the info. Or, if you prefer, you can ask them when they call at your home, or if you work alongside them.
Unless you get the full and correct information, you will never understand why Jehovah's Witnesses believe what they do. Anyone can start rumours, and very much like "chinese whispers", they develop wrong thoughts and ideas.