Space-time is itself a result of the big bang and you should, as other posters have indicated, include your concept of “before” in that.
As for your critique of the quality of writing in the scriptures, none of it was written by monks, it is some of the best literature ever written (you should try Ecclesiastes for starters, or Psalms) and is far more literate, even in translation, than most gifted writers could hope to produce.