Regarding the WT's teachings of the completion of 6,000 years of human existence an of other teachings notice what is said in the "THE AUTHOR'S FOREWORD" by Charles T. Russell dated October 1, 1916 to Volume II (The Time is at Hand) of Studies In the Scriptures. [See http://www.ctrussell.us/d01f9bc2626a96a38625699900786730/292532fd2e3e86a5862564520013da70_7b4ad6db.html .]
'This Volume makes no claim to infallibility, and no claim of any direct inspiration from God in the interpretation of His Word.
... The Bible chronology herein presented shows that the six great thousand-year Days beginning with Adam are ended, and that the great Seventh Day, the thousand years of Christ's Reign, began in 1873. The events of these 43 years, which this Volume claims as the beginning of the Millennium, we still find fully corroborating Bible prophecies, as herein set forth. During these 43 years, nearly all the inventions of our day have been accomplished. The sewing machine, one of the first, began to reach its perfection 43 years ago. Since then, we have all kinds of farming machinery and tools, and workshop, store, factory and home conveniences, in abundance and cheap--through human invention. These are shortening the hours of labor, and doing away with the "sweat of face," which the Bible declares to be identified with the curse.
... We could not, of course, know in 1889, whether the date 1914, so clearly marked in the Bible as the end of the Gentile lease of power or permission to rule the world, would mean that they would be fully out of power at that time, or whether, their lease expiring, their eviction would begin. The latter we perceive to be the Lord's program; and promptly in August, 1914, the Gentile kingdoms referred to in the prophecy began the present great struggle, which, according to the Bible, will culminate in the complete overthrow of all human government, opening the way for the full establishment of the Kingdom of God's dear Son.
Notice that though bold claims were made, it was also stated that they were not claimed to be "... any direct inspiration from God in the
interpretation of His Word." Russell and his WT organization was trying to have it both ways!