“When people ask me if a god created the universe, I tell them that
the question itself makes no sense. Time didn’t exist before the big
bang, so there is no time for god to make the universe in. It’s like
asking directions to the edge of the earth; The Earth is a sphere; it
doesn’t have an edge; so looking for it is a futile exercise.” “If the
universe is really completely self-contained, having no boundary or
edge, it would have neither beginning nor end.” - Stephen Hawking
Why is there something, the universe or God, rather than nothing? This is an illogical nonsense question because impose an impossible explanatory demand, to deduce the existence of something without using any existential premises. The Big Bang theory is only one of possible cosmologies other is the quantum and string cosmologies. We do not know yet if the best model, but there are good reasons to think that the big bang is not necessarily the absolute beginning.
The "universe has a beginning" can be a composition fallacy: “Everything in the universe has a cause or beginning, then the universe has a cause or beginning”. Everything in the universe has a localization, but the universe hasn't a localization: it is a composition fallacy."The universe has a cause" can be a ignorance fallacy too: "There is no evidence for a universe without beginning, therefore, a cause must have existed".
Some have argued that because the universe is like a clock, there must be a clock maker. This is a slippery argument, because there is nothing that is really perfectly analogous to the universe as a whole, if your question is about the whole, because everything is just a part of universe.“The universe has a beginning, therefore the universe has a cause”, begs the question, a classic fallacy. Begging the question or assuming the point at issue is an informal fallacy. An argument begs the question when it assumes the controversial point not conceded by the other side. If “The universe began to exist” or not is the point at issue, not the premise.You can not give a imaginary definition of attributes of God or a flying pink unicorn, as timeless or out space being or an uncaused being, as proof of existence. If everything has a cause, then God must have a cause. If there can be anything without a cause, it may just be the universe as God. Of all the approaches to God’s existence, the deduction is the strategy that we would expect to be successful there were a necessary God. But there isn't a valid deduction of a non logical existence, then we can conclude that there isn't a necessary God.