The Watch Tower Bible and Tract Society (WTBTS), also known as the Jehovah's Witnesses (JWs), was formed as the Zion's Watch Tower in 1879 by Charles Taze Russell.
Because of his rejection of the concept of Hell, Russell began to challenge many other concepts in the Bible and ultimately added and removed the ones he didn't agree with until he built a theology that does not even mirror Christianity any longer. Many of these original retranslations and interpretations can be found in his series of books called, Studies in the Scriptures.
Jehovah's Witnesses deny the deity of Christ, His physical resurrection and His visible return. They teach that the first creative act of the Father was to create the spirit being, Archangel Michael, who later donned a physical body to be seen by his followers in the persona of Jesus. Additionally, they hold that as Jesus, the Archangel was a perfect man who became the Messiah at the time of his baptism. The resurrection of Jesus is said to be a spiritual one, not a physical one.
As seen above in the salvation section, JWs have their own unique interpretation of the end-times events and of whom the Scriptures are speaking. They deny the doctrine of the rapture of the Church and are incessant date setters, with false prediction after false prediction about the timing of Armageddon.
Their most notable dates (which usually were followed by promises never to date-set again) include 1914, 1918, 1925, 1975 and 1989. When the 1914 date failed, rather than acknowledge it as a false prediction, they simply declared that Jesus had returned to the earth in invisible form. They continued setting Armageddon dates for future fulfillment.
In the Book of Galatians, the Apostle Paul warns about receiving another gospel from an angel who does not agree with the message of Christ:
Gal 1:8: But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
"...the heavenly messengers or angels of the Lord now used by the Lord in behalf of the remnant. These angels are invisible to human eyes and are there to carry out the orders of the Lord. No doubt they first hear the instruction which the Lord issues to his remnant and then these invisible messengers pass such instruction on to the remnant" (Vindication, volume III, 1932, p. 250).
"Again God put it in the mind of his people, by his angel, to act and to carry out his purposes" (Light, volume 1, 1930, p. 120).
Sadly, with their twisting of Scripture to make it read how they want it to read as opposed to accepting it as the Word of God, they have totally gotten lost in the process and have become yet another legalistic, man-made religion teaching you can work your way to heaven.