NomadSoul provided us with a photocopy of Wallace' explanation on John 1:1. Wallace where he states that ‘the evidence is not very compelling to take theós as a definite noun at Jn 1:1c.’ He further writes ‘that to call theós definite as if it had the article would be embryonic Sabellianism or modalism.’ Are you listening godrulz?
Wallace, as a trinitarian, has a problem though when it comes to explaining the singular anarthrous nouns preceding the verb as a possible indefinite. However, in the same page, he does not hesitate to argue that the translation of John 4:19 is most naturally: "Sir, I perceive that you are a prophet," similar to the NWT wording. The grammatical construction of John 4:19 is similar to that of John 1:1c. Now, how do most bible translations render Jn 4:19? Like this: "a prophet." When he comes to with Jn 1:1c, he mentions that "a god" translation is "improbable." Notice he did not say "impossible," as it cost Barclay a lot criticism for saying that, and Barclay had to correct himself on that. Wallace's objection is mainly theological, not grammatical, even if he wants to imply that is a grammatical issue. He mistakingly invokes polytheism, but Jesus proved him wrong when he stated that even man of old could be called "gods." (Jn 10:33-36)
NomadSoud did not provide us with the next page of the quoted book, where he asks: "Is [Theós] in John 1:1c Qualitative?" His answer is: "The most likely candidate for [theós] is qualitative." Also, Wallace did admit that "It is nevertheless difficult to distinguish indefinite from qualitative nouns at times..." Furthermore, in his quest to belittle the NWT he makes use of R. H. Countess flawed analysis of a rule the WT never made. Not only that, in a way he criticized scholars who made use of Colwell's rule concluding that such "rule" says nothing of definiteness. And Countess was one of the scholars who misunderstood Colwell's rule. This shows that no scholar is above reproach, and theology plays as much bearing as it does in the average JW or other church-goer. I like Wallace's Grammar a lot, but at times he goes overboard with his interpretations.
One poster here keeps saying all over this site, that Jesus being "Son of God" makes him equal to God. If we were to use his reasoning, then it would mean all the "sons of God" (angels) mentioned in Genesis, Job and Psalms would be God's equal. Does that make sense? Of course, Jesus in a way is the Son of God, unlike the others, who are under Christ. But the term itself is no guarantee that the entity is identical with God. By the way, the holy spirit is never mentioned as a "Son of God."