I’ve got to jump aboard this train… the Big Bang Theory says nothing of what happened before a certain point of our universe, much in the same sense where the theory of evolution does not explain the origins of life but how life came about afterwards.
Oh wait @T_aquaticus already explained this to you but you ignored him. The BBT does not say the universe emerged from nothing. Not by any means whatsoever. Where are you getting this idea from? Very few cosmologists actually argue that the universe came from nothing as in the spontaneous generation of even the laws of Physics but some papers have been written on the topic (i.e. Spontaneous creation of the Universe ex nihilo). Most cosmologists don’t argue that the universe came from nothing, nor do they write papers on such. A casual summary of say bouncing cosmologies is written here: What If the Big Bang Wasn't the Beginning? New Study Proposes Alternative | Space. There was even a nice debate in Scientific American about models of the beginnings of the Universe:
A Cosmic Controversy - Scientific American Blog Network
This is just a small sample of models, all of which receive constraints with the more data we have. But instead, what it looks like you are proposing is that cosmologists are definitely wrong and you know absolutely that there was nothing as in really nothing except God before our universe.