BTWThis is a bit desperate to just deny it, pivot, and quote sources who simply agree with you. Here are some Trinitarians and misc. others who disagree with you.
Scholar Jason David BeDuhn states that the absence of the definite article makes the two occurrences of “God” “as different as ‘a god’ is from ‘God’ in English.” He adds: “In John 1:1, the Word is not the one-and-only God, but is a god, or divine being.”—Truth in Translation: Accuracy and Bias in English Translations of the New Testament, pages 115, 122, and 123.
NOTE: The often quoted Jason BeDuhn, as in favour of the rendering 'a god', has his PhD in Comparative Religious studies, not in Biblical languages and, unlike the above mentioned scholars, is not recognized in the scholarly community as an expert in Biblical Greek, although his degree does require an intermediate level of competence in Greek.