The Governing Body and its Watchtower Society claims that in 1919 it was appointed by Jehovah God and Jesus Christ to represent all of their earthly Kingdom interests, to be their unique voice and sole representative towards all people on earth. The Watchtower’s authority lives or dies with that claim.
The Society’s critical date of 1919 is calculated from the dates of events in the 6th century BCE. Does the Society provide consistent, objective, and undeniable evidence for its appointment in 1919? Is that evidence strong enough to make a person devote their life and energy to the Watchtower and to its Governing Body?
http://www.jwstudies.com/Watchtower_s_607_BCE_Foundation_Exposed.pdf