In [the] beginning the Word was, and the Word was with God,
and the Word was a god." The New World Translation
This is one of the most common verses of contention between the Jehovah's Witnesses and Christians. Their false assumption is that Jesus is not God in flesh, but Michael the archangel who became a man. Therefore, since they deny that Jesus is divine, they have altered the Bible in John 1:1 so that Jesus is not divine in nature. The New World Translation has added the word "a" to the verse so it says, "...and the Word was a god." The correct translation for this verse is "In the beginning was the Word and the Word was with God and the Word was God." This is how it is rendered in the NASB, NIV, KJV, NKJV, ASV, RSV, etc.
The New World translation is incorrect in its translation of this verse for several reasons. First of all, the Bible teaches a strict monotheism. To say that Jesus is "a god" is to suggest that there is another god besides YHWH, which is contrary to scripture (Isaiah 43:10; 44:6,8, etc.). Of course, the Jehovah's Witnesses will respond that Jesus is not the Almighty God, but a "lesser" kind of God. He is the "mighty God" as is referenced in Isaiah 9:6, "For a child will be born to us, a son will be given to us, and the government will rest on His shoulders, and His name will be called Wonderful Counselor, Mighty God, Eternal Father, Prince of Peace." Therefore, they say that Jesus is the mighty god, but not the Almighty God.
The immediate problem with this explanation is that YHWH is also called the Mighty God in Jeremiah 32:18 and Isaiah 10:20. In all three verses, including Isaiah 9:6, the Hebrew word for "mighty" (gibbor) is used.
Isaiah 10:20-21, "Now it will come about in that day that the remnant of Israel, and those of the house of Jacob who have escaped, will never again rely on the one who struck them, but will truly rely on the LORD, the Holy One of Israel. 21A remnant will return, the remnant of Jacob, to the mighty God."
Jer. 32:18, "who showest lovingkindness to thousands, but repayest the iniquity of fathers into the bosom of their children after them, O great and mighty God. the LORD of hosts is His name."
We can see that the Jehovah's Witness explanation is not valid. Both the Son and God are called the Mighty God.
EDIT..Are you sure about that starjumper?
We know from John 1:14, that 'the Word', 'Logos' in the original manuscripts, in John 1:1 is Jesus of Nazareth, the Christ.
- - "And the Word became flesh and dwelt among us, full of grace and truth; we have beheld his glory, glory as of the only Son from the Father."
Verse 1, tell us that Jesus Christ is eternal, that He was with God, and that He is God. There can be no doubt that this verse means that Jesus, the Christ, is Jehovah God. The word-for-word translation from the original Greek manuscripts read, "-and God was the Word.". The Apostle John knew this to be true for in writing this verse he used 'ho theos', from which 'God' is translated in the original manuscripts. The Greek TITLE 'ho theos' was used exclusively, by ALL the writers of New Testament, to indicate only the God of Israel, Yaweh - Jehovah. For a more in-depth explanation see ho theos. Verse 3 also bears testimony to the fact that Jesus is GOD.