@TuringEquivalent,
OUR universe must exist because of the deterministic universe theory, that suggests all actions are simply results of pervious actions. The first action is the causer which is explained next:Quantum mechanics deals with very small things;atoms and even smaller particles. It tells us that there really is no such thing as empty space. Even vacuums are filled by particles and antiparticles, which flare into existence and almost instantaneously fade back into nonexistence. The virtual particles don't last long enough to be observed, but scientists know of their existence because of their effects. Stephen Hawking, at the University of Cambridge, found that "In quantum physics, if something is not forbidden, it necessarily happens." They have found that when quantum theory is applied to space at the smallest possible scale, even space becomes unstable and it churns and froths into tiny space time bubbles. It destabilizes. In other words, bubbles of space and time can form spontaneously. If it is possible that these space time bubbles can come into existence from nothingness, it is certain they will because of Hawkings previous assertion. If it is possible, and actually certain that these space time bubbles come into existence from nothingness, it is not a big strech to believe space time bubbles could have come into a nothingness when the universe was created, and somehow propelled the big bang forward. A thory called cosmic inflation theory proposes this. Therefore, the universe must exist, because tiny spacetime bubbles must be created from nothingness, if it is possible for them to come into existence at all. It is one of the properties of quantum theory.