In at least my point of view, the Big Bang implies that the Universe is not infinite and thus had to have had a beginning, rather than being infinite and without such a need. Had it been of infinite length, it wouldn’t need a first cause (a Theistic entity we’ll say), but because the Big Bang did originate the Universe, a first cause would logically have to be involved, and this first cause by my definition would be the theistic entity (God). Or in other words, The Big Bang Theory affirms the existence of God.
Now I know I’ll start some trouble with all this because I know non-theists disagree and possibly other theists think there’s more to it. So, does the Big Bang do more for the case of theism or atheism?