Look, the "Big Bang" wasn't something from nothing. There are 3 leading hypotheses as to the cause of the Big Bang, which I'll try to express at your intellectual level.
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OK, can't do that. Get a dictionary for the big words, now.
One hypothesis (forgive me if I mess up details on any of these) states that 2 sheet-like structures in hyperspace collided, causing a "big splat" which converted kinetic energy into matter, creating the universe in a tiny state, constantly growing at insane speed.
Another hypothesis states that all of the matter which currently exists was compressed into a singularity which erupted, creating the dimensions in the process.
The last hypothesis states that if no matter did exist, there would be no energy at all in the universe. However, in one sense, the universe does not have energy, because of dark matter, dark energy and gravity keeping each other in check. According to that theory, absolute nothingness is an unstable condition, so matter could spontaneously form in nothingness. Gravity and dark energy forming would keep the energy of the process in check, so the law of conservation of mass would not be violated.
Asking "what came before the big bang" is like asking "what's north of the north pole"? It's irrelevant. Science can show a good reason for the big bang as the start of everything, as opposed to your "theory" of an uncreated God creating the universe, because nothing else can come from nothing.
