It's like this, I believe God initiated a sort of domino effect by creating a thing known as inertia, also regarded as energy. Spirit as well as an even greater potential energy known as soul, was born and began racing in many directions, giving birth to more souls, due to the fact that from the start of the initial one, it was also built with an infinite capacity to duplicate and or replicate, just mike mitosis or cellular division.
God knew he had to give such a powerful entity limitations so he bounded such a creation into an ever lasting abyss, also known as the cosmos to the scientific mind, or the heavens to the religious type, either way its the same thing.
From the bounded barriers being erected, now the possibility of creating an actual surface came into the game, where a single particle was formed since the very first soul in its enclosed microcosm in comparison to its creator, had multiplied a Gazzilion times over.
Soon came dust, and then the collections began, and gravitation as well as attraction was born, allowing for the acceleration and spontaneous collision process. Things got hectic after while because this ever duplicating soul began to fill these well defined boundaries known as the cosmos, and next thing you know spontaneous combustion was born, god had it all figured out though, now these souls had no name, no idea, no given purpose at the time, all it knew how to do is expand, and grow, and multiply, then outgrow its space given, and continuously repeat such a process, until the very first nebula and universe was born our of such hard laboring. The big Bang yeah it definitely happened, but God initiated it all, and thus why we see its so hard to prove why we exist in the first place.
Religion wants to argue their side, scientists wanna defend their strategic approach and findings, but some day they all going to come together and realize what I just felt all my life, and truly believe has occurred, but who knows, Right!
We exist because we can, and trying to prove such is absolutely pointless in my book, but go ahead and try, it will only get you back to the same starting point we all began at, because that's how existence is, its repetitive as ever.