they are a splinter off the advent movement out of the second great awakening. however, most of their beliefs did not come from adventistism but from literalists, such as age to come believers. jehovahs witnesses are not an offshoot of another religion, but doctrinally they probably have a closer connection to christadelphians, for example, than to adventists.  they worship a name, and not god.  they deny the divinity of christ.  they reject sabbatarianism, on any day. they keep making false end times predictions. their brains are broken
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