answer:We have no idea what was before the event horizon that the current Cosmic Microwave Background Radiation presents. It strongly points to a Big Bang, as does myriad other observable data, but it has absolutely nothing to say about what was before the Big Bang, or whether that is even a well-formed question. What’s so terribly hard about saying “I don’t know.” and then looking to find out instead of making up completely unsupported conjectures to “explain” those things we don’t yet know? We do know that quantum chromodynamics require that things come from nothing all the time. We can observe that. It is also possible that the Universe in some form is eternal, and that it just went through a phase change at the Big Bang, perhaps one of an infinite number it goes through. Then again, string theory may prove to be the answer, in which Universes will be branching off all the time, and we just happen to find ourselves in one that’s perfectly suited for life, because how could we find ourselves in one that was adverse to life? You are trying to apply human logic evolved from hunter-gather survival on the African Savannah to something that happened 13.73 billion years ago. Human logic can’t even begin to grasp time that deep. It’s small wonder it leaves you agape. But rather than plug in answers with no evidence, as in saying “God did it.” you gain much more by admitting the truth. “We don’t know, but maybe we can find out.” For what reason. There doesn’t have to be a reason if it’s eternal and there is a set of laws of physics it works within.