Actually, believers in the Big Bang do believe that everything came from nothing because they cannot allow for an intelligent designer to have created it in the first place. First, there was nothing that was nowhere, then there was everything contained in a singularity which instantly began expanding into everything that we see today because gravity didn't exist to hold it together. They firmly believe that everything came from nothing, even our experience today says that nothing can come from nothing.I'm not asking about the universe, I'm asking about existence. Do you believe that existence came from nothingness?