If it was there prior to T=O which is as far as GR can go, then it had to exist in a state of timelessness.
It didn't
have too. There could be time that is less than zero... negative time, if you will.
So if it had been there in a timeless state why all of a sudden did it start to expand?
You seem to be thinking of the singularity as hanging out for a while within some "place" and then one day it just starts expanding. This is not within the Big Bang model.
There has to be a cause, as there was a timeless nothingness except the minature universe.
Perhaps the sigularity didn't exist for any amount of time and the universe has been exanding for all of time.
Same thing if it was sitting there in Hawking's imaginary time why did it all of a sudden start to expand?
Perhaps a 'different' universe existed before T=0, which was collapsing into a singularity, and then immediatly after reaching a singularity began to exand again into the universe we are experience this time around.
The point is, there did not have to be a cause.
Besides, even if there did have to be a cuase, that cause doesn't have to be god.
™ Version 4.2
