Almost no-one begins the story of life with the big bang, the story of the universe however does often start with the big bang, but certainly not everybody goes that path, <nods to creationist dudes>
Anyway, I've been reading and watching a bit about M-Theory and I'm sure one idea was that the big bang was just one in a series of big bangs caused by 'branes' bumping into each other in 11 dimensional space.
I don't claim to understand but I am fascinated by it.
Have a look at
http://www.pbs.org/wgbh/nova/elegant/ if you seriously want to know more.