According to the Heisenberg Uncertainty Principle, there is no such thing as absolute zero energy (also called vacuum energy) in infinite space for infinite time. In fact, energy fluctuations in empty space cause virtual particles to spontaneously come into existence all the time. According to Lawrence Krauss, virtual particles account for most of the mass in the universe (see http://www.youtube.com/watch?v=7ImvlS8PLIo&feature=relmfu)
If it is impossible for energy not to exist, then by definition energy is necessary. Therefore God is not necessary for the existence of energy.
If energy is the cause of virtual particles, then virtual particles are contingent upon virtual energy and not upon God. Virtual particles are a type of matter. Then God is not necessary for the existence of all matter. If Krauss is right, that virtual particles make up most of the mass of the universe, then God is not necessary for the existence of most of the matter in the universe.
Edward P. Tryon proposed back in 1973 that the entire universe was the result of a large-scale energy fluctuation. Work to understand how the matter we observe can come into existence from energy fluctuations is still underway. A new class of high-energy experiments will shed new light on this question now that the Large Hadron Collider (LHC) is online. Rather than speculating now that all matter is contingent on energy and not on God, let’s stop here and be content to narrow God’s gap. In the mean time, we’ll continue to ask theists to justify their special pleading when they claim that “everything is contingent… except God.”