If God can exist without having been created, so could matter and energy, with disregard to the currently existing universe needing to be created from scratch or not.

Why you cannot assume that the big bang is evidence for the existence of God.

Matter and energy may have always existed. Matter and energy may be eternal. If the universe had a beginning, this does not necessarily mean that matter and energy also had a beginning, because assuming the universe began with the big bang, this still does not necessarily mean that matter and energy began with the big bang. Assuming that the current universe began with the big bang, there’s still nothing in this assumption that indicates that matter and energy also came to existence or started to exist since the big bang as well. Just as religion claims that there is a god that is eternal and that has always been existing, there is nothing that makes the belief that matter and energy have always been existing, that matter and energy are eternal, or that matter and energy will always exist forever impossible to be true. The same lack of reluctance to have a problem with the idea that god is eternal, that god has always been existing, and that god will always exist forever, as proposed by religion, is supposed to make anybody that has that same kind of lack of reluctance mentioned above also have no problem with the fact that it is possible for matter and energy to be eternal, to have always existed, to have been existing since ever, or to be able to continue on existing forever. If for some reason you have a problem with that when it comes to matter and energy, you are supposed to have a problem with that when it comes to God as well.

Just as God could have existed without having been created, the universe could have existed without having been created as well. If god doesn’t require a creator to come to existence, then the universe also could come to existence without requiring a creator. Why would someone believe that God is the only exception there is from the inability or the impossibility of anything whatsoever to come to existence without a creator or without having been created?

There’s nothing that indicates that matter and energy existed at some point where before that there was no matter or energy whatsoever. There’s nothing that indicates that at some point in time there was no matter or energy at all, and then suddenly afterwards matter and energy started existing abundantly in a manner that cannot be explained except by assuming they must have been created or brought into existence by a supernatural being. If the big bang is the beginning of life on earth as we know it, whether directly, or indirectly, and since that was an event that took place at some point in time, then it is safe to assume that there was no life on earth or that there was no earth in the first place before that event (the big bang). One could claim that such event was initiated or created by the supposed God they believe in, but this would inevitably lead them to admitting that this God is responsible for creating life on earth or the universe as we know it only, not necessarily creating everything that has ever existed before that from scratch or from nothing as well. Anything that preceded such an event (the big bang), would not necessarily need to have been created by a supernatural being like a God, because you have no evidence that whatever that existed before such an event – the big bang – needed a creator, that is, couldn’t come to existence or is impossible to come to existence without having been created by a single entity or multiple entities that are totally external to it, distinct from it, and not part of it, because none of what could’ve existed before the big bang event, or whatever event you assume was the beginning of the currently existing universe or life as we know it, appeared out of nowhere suddenly, or came to existence suddenly, or in no time, and thus must have been created by an external supernatural entity, or multiple external supernatural entities, and couldn’t have existed or have been existing since ever (like God), or gradually came into existence throughout a prolonged period of time (like evolution). You have no evidence for any of the above. You only claim that since everything began by a big bang, therefore God must have been the one who put things in place in order for that big bang to take place. In other words, God must have been the one who has created the big bang, as if nothing before the big bang existed or could ever exist, or could have ever existed, and as if the inevitability of explaining the occurrence of an event like the big bang by assuming it must have been set in motion by a creator of the universe means beyond the shadow of a doubt that nothing can exist before the big bang, or whatever that existed before the big bang must also be or have been created by a God.