I got it. Huge problem, though. "South of the south pole" and "before the big bang" aren't remotely the same thing. Aside from the fact that you can't prove there was a "big bang" (only accept the incumbent theoretical framework of a subset of astrophysicists), there is more. Even if you accept the "big bang" premise, you can't prove that there haven't been other "big bang" events, perhaps separated by hundreds of billions of years, and by regions of emptiness many times the size of our universe.
For all you know, God squeezes out universes on a semi-regular basis, like dough from a cookie gun. Perhaps "big bangs" are simply how God sets a hard limit on mortal comprehension, shows prima facie evidence of the futility of scientific arrogance, and a provides a window on the transcendant spiritual dimension.