It's not true that Bible-Greek contained no articles. New Testament Greek contained the definite article.
So in John 1:1 where it says: "...and the Word was God" if anyone wants to claim there should have been an article placed before God, it could only have been the definite article the and not an indefinite article a - because no such indefinite article existed as a preposition, in Bible-Greek. The Bible is clear that there is only one God - double reason not to take the article as indefinite, even if an article need be used at all here.
In actual fact, Bible-Greek did indicate the indefinite article - by changing the way a noun ends - not by a preposition. And no such noun-ending is used in John 1:1. Therefore The New World Translation is incorrect. The Word was not merely a god - the Word was indeed God.
Jesus is God!