Well ignoring the massive misconception that there was nothing before the big bang i would say, two volatile particles collided and the resulting explosion was the big bang.
The emanating radiation is a strong suggestion that this was the case. Also as the entire universe is about 1% of what was created in the big bang i do not believe that it was crafted or designed. It's commonly known now that almost all of the matter (regular, strange, anti etc) annihilated itself and everything around it about an instant after it was formed. We are the crumbs on the edge and it was all natural.
The emanating radiation is a strong suggestion that this was the case. Also as the entire universe is about 1% of what was created in the big bang i do not believe that it was crafted or designed. It's commonly known now that almost all of the matter (regular, strange, anti etc) annihilated itself and everything around it about an instant after it was formed. We are the crumbs on the edge and it was all natural.