DocHouse: The WTBS teaches nothing unbiblical that I know of.
The WT Society has openly admitted it goes beyond scripture, then mandates these rules/doctrines must be followed:
"A basis for approved fellowship with Jehovahs Witnesses cannot rest merely on a belief in God, in the Bible, in Jesus Christ, and so forth. Simply professing to have such beliefs would not authorize one to be known as one of Jehovahs Witnesses. Approved association with Jehovahs Witnesses requires accepting the entire range of the true teachings of the Bible, including those Scriptural beliefs that are unique to Jehovahs Witnesses" (Watchtower, April 1, 1986, p. 31).
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In a "Questions from Readers" column in the 4/1/86 Watchtower, the organization provides a list of doctrines that a person must adhere to in order to remain in good standing among Jehovah's Witnesses. The list includes more controversial doctrines not found in the list a student must believe. Two significant ones are:
1. That there is a "faithful and discreet slave" upon earth today entrusted with all of Jesus earthly interests, which slave is associated with the Governing Body of Jehovahs Witnesses (as of 7-15-13, the Slave is The Governing Body).
2. That 1914 marked the end of the Gentile Times and the establishment of the Kingdom of God in the heavens, as well as the time for Christs foretold presence.
It is common for these particular teachings not to be advertised to newly-interested persons, because they are the most difficult to accept. Yet, as the article asserts, adherence to these doctrines is essential to remain in good standing.