How do you know there was a time when nothing existed? We know that the current universe probably started with a singularity but no-one has ever said how long that singularity existed before it became the universe that we all know and love today.
For all we know, the singularity has always existed, negating any need for a supernatural explaination.
For all we know, the singularity has always existed, negating any need for a supernatural explaination.