I think the question here is not "What do they believe?" but rather "How do they apply and enforce it?"
The WTS has had and still has a weird set of beliefs that MUST be accepted in its entirety or risk some kind of discipline if personal choice is made known.
Many other religions enforce similar disciplinary action if the entire set of beliefs is not accepted.
But there are also many religions that have a set of beliefs but it is not required for any member to have to accept every part. No one asks them a list of questions to make sure that every bit is believed.
I think you find many aspects of a cult in many relgions (or other groups). You might also find a list of required beliefs. But most of the time a person will not be tossed out if they don't believe everything. Most people know that Catholics have a rule of excommunication. But you seldom hear of anyone who was excommunicated.
What a person believes and how often a discplinary action is enforced is a far greater indicator of how open a group is.
It is very important to separate the beliefs from the actions as well as separate God from an organization or leader(s)