We all talk about the big bang as this moment the Universe begins by popping into existence with simple hydrogen and some helium. Hydrogen and Helium are gases that are able to carry sound. Today, space has expanded so much that there is vacume beyond where matter clumps together to form stars/planets, which means the sound couldn’t propagate, but the early early Universe wouldn’t have clumped like today; there would have been hydrogen everywhere. This means it would have been loud everywhere.
*Edit: I know we call it the Big Bang because of the rapid expansion of spacetime, but I always just pictured the general motion of expansion as the “bang”. Never thought of how loud it would have been.
Where did that come from? Is the question indeed
However labeling or criticizing just how anybody is looking for the answer, is just wrong and usually insulting, even to scientists.
Science is about answering the unknown and making it known. We know it wasn’t a guy in sandals so far and have yet to see evidence of a god in space so far, at least the one that puts cancer in children to teach them a lesson on life bed demands you to read a book made by King James.