All forms of belief have structure and certain boundaries. It could be argued that Atheism is a form of social religion which looks to people such as Richard Dawkins as spiritual leaders for guidance. A lot of Religions have grown from philosophical origins like buddhism, Taoism that have added spiritual practises to their beliefs and come to worship their originators.
Jews, Christians and Muslims all have roots from the Bible and claim their main beliefs originate with the bible. That being said you have noticed as with Pentacostals that some of their practises are drawn from outside the bible. Like having a lively spectacle based religion that are designed to be very popular and entertaining.
Jehovah's witnesses are a Christian branch of monotheistic belief in Jehovah Almighty God the father alone and are drawn from the bible truths that were thought to have died out in the early centuries. When the then ruling Trinitarian Christians systematically and deliberately went on a seek and destroy mission on all remnants or resurgence of this belief. This christian branch finally flourished again when the bonds of trinitarianism where weakening in the 19th century to eventually become the Jehovah's witnesses we know today uniquely monotheistic to Jehovah God and using his name, specifically identifying themselves as Jehovah's People.
The biblical point that there would be a group of people identifiable as God's people by their adherance to his word is something everyone must decide for themselves when checking on a Religion's claims against the Bible (God's word). Many People reject any belief in the bible or religious leanings but they do still have set patterns of belief molded by modern culture, thoughts and popular celebrations.
