The original writers of the Bible used entirely different words and titles for the divine. If you study the primary languages of the texts, you'll see specific words employed rather than "God".
Hebrew Texts (Old Testament): The most common words are Elohim (אֱלֹהִים), which is a general term for deity, and YHWH (יהוה), the personal, revealed name of the Creator, often translated as LORD in English.
Greek Texts (New Testament): The writers used Theos (θεός) or Kurios (κύριος), which are the common Greek words for "god" and "lord."
Latin Texts (Early Translations): Translators adopted Deus (and Dominus for Lord).
Because English didn't exist when the Bible was written, translators used the preexisting Germanic word "god" as a bridge to translate Elohim and Theos into English.
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