[Mr. Nobody]

As the word creation entered our vocabulary, as our finite mind framed the world within its limited existence, as we attempted to interpret reality within finite discreetness, questions like yours arose. Inflation, big bangs, expansions, cosmic cooling, all of that seem to point to phases of one everlasting thing: Matter/ energy. The first law of thermodynamics is the TOE: Energy cannot be created nor destroyed but only transformed between states.
The reason we prescribe a beginning and an end is due to an emergence of a highly organized consciousness that has the awareness of birth and death within its biological vessel. This consciousness evolved as a response to increasing entropy within the current epoch of our cosmos.
The notion of separatism, an intelligent creator that willfully has control over and acts on behalf of, needs to be abandoned when all evidence points to an existence without reason nor intent, subject to the cold grind of evolution only. Once you understand the true meaning of infinity, time without a beginning nor end, then the notion of a creator becomes meaningless.