Why is the New World Translation Bible so different from other versions?

On what do they base their translations? What Hebrew, Greek, etc. scholars have contributed to this version? Why does the Watch Tower promote this Bible over the NIV or KJV? Genesis 1:2 (NWT) Now the earth proved to be formless and waste and there was darkness upon the surface of [the] watery deep; and... show more On what do they base their translations? What Hebrew, Greek, etc. scholars have contributed to this version? Why does the Watch Tower promote this Bible over the NIV or KJV?

Genesis 1:2

(NWT)
Now the earth proved to be formless and waste and there was darkness upon the surface of [the] watery deep; and God’s active force was moving to and fro over the surface of the waters.

(NIV)
Now the earth was [or possibly "became"] formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters.

(KJV)
And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.

John 1:1-2

(NWT)
In [the] beginning the Word was, and the Word was with God, and the Word was a god. This one was in [the] beginning with God.

(NIV)
In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning.

(KJV)
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginnning with God.
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