How Could the Universe be Created From Nothing?
     This is a funny thing for evolution deniers to ask, as their creation "theory" says the same thing, but here goes. 
     The total known energy in the universe adds up to almost zero.  The potential energy of the  gravitational attraction of the galaxies is proportional to the mass of the galaxies.  Since energy must be supplied to push the galaxies apart, as is shown by red shift, this creates an incredible amount of negative energy.  The mass energy of every particle in the universe creates an incredible amount of positive energy.
     At the moment, known positive energy is smaller than known negative energy by about a factor of ten.  If the remaining numbers equal zero, then the universe could be created from vacuum.  Scientists are looking for these numbers called missing mass, and there are several theories that could account for it, including dark matter, neutrino mass, and black holes. 
     My personal theory involves the existance of a black hole in the center of most, if not all, spiral galaxies.  While black holes have yet to be completely and irrevocably proven, there is proof that something is in the center of several galaxies.  These somethings behave exactly the way black holes are supposed to.  These black holes could account for the missing mass and additionally provide for the mechanisms for my personal theory.
                                     Phoenix Universe Hypothesis
                                                    by Desdenova
     As entropy increases, the universe slows, grinds to a halt, contract.  The galaxies collapse into their parenting black holes,  fiery chaos ensues.  The black holes begin to attract each other, they converge, and  collapse into each other, forming a super black hole.  The super black hole, being inherently unstable, explodes.  The process of creation begins anew out of the ashes of nothingness.