As usual, mibn2cweus, were speaking in two incompatible languages. But, if you can, just for a moment, consider that, if there was an entitiy that could create the universe and especially time since time began at the Big Bang, then is not probable that the entity is totally outside of time and the creation? In other words, the immutable physical laws do not govern the entity since it created them. Therefore, no previous existence for that entity in required. That entity has always been... even that phrase doesn't do justice to the idea of such a Creator, since the adjective always implies the concept of previous time, which does't exist for that Creator. Most people's thinking is way to small and confined when considering the possibility of a Creator.
The only conclusion one can reach is that the universe created itself, man created the universe or a Creator created the universe... somehow, I don't think the first two have any validity but, in any case neither of the three are totally provable.
A group of scientists approach God and, shaking their fists state "We don't need you, we've found the secret of life and can create man out of dirt just like you did"... God replies, "OK, show me." One scientist reaches down to pick up a handful of dirt... God says "Hold it!... get your own dirt"...