Sometimes people find it thorny to fathom how the Universe could just exist - it must have come from somewhere? Well, understanding that the Universe is without time helps to resolve this recurring thought. It follows from this this that the Universe is just here, it is timeless, It just was, is, and will be. It occured to Einstein - the Universe just IS.
Everything you have just mentioned is part of the Universe, as is time itself. The Universe contains past, present and future. The Big Bang is just one part of the Universe - it may be the beginning of time, but it is not the beginning of the Universe, for it contains time itself. It is far grander than your ideas of a god. And it is real