Big bang theory question

mass takes up space
all mater has mass
so for matter to exist there must be empty space for it to occupy
space is a characteristic of a universe
the big bang is the creation of the universe
so that would mean that at the time before the big bang that existence did not exist and there was no empty space or space at all
but the big bang was caused by hydrogen and heluim exploding
but hydrogen and heluim are matter that take up space which did not exist so im asking is how could matter exist before the start of everything including space and if you say pre big bang there was space and matter than what did the big bang start
it be more like a huge expansion of the current universe not the creation of a new one if it happened at all unless the our universe is a black hole theory is true but than your left with the question what caused the first big bang to make the first universe i just dont understand how matter could exist before existent
based on my research i believe that there is a god that had divine intervintion and this world is almost like his gaint math problem everything is math and every event was determined to happen mathmeticaly at what time before creation and that no religon is wrong but is other people telling about the same event based on there culture fables geo influnces capcity time and there needs and changed through telphone game

Your question is not about the Big Bang theory.

The Big Bang theory is NOT about the creation of the universe. The Big bang theory can only describe what happens after a moment called the Planck Time; at that moment, the universe already existed, energy was already present and space was already expanding.

The Big Bang was NOT caused by hydrogen and helium exploding: it is well known that hydrogen and helium came after the Planck Time, and that their coming into existence is very well explained with relatively simple scientific principles.