Firstly, big bang is just a theory. Secondly, there is no proof that this known universe did not exist before it. Lastly, many a Nobel prize winning physicist as Schrodinger, Max Planck, Heisenberg etc. did not agree with it. To them, the universe seemed to have existed forever, from afore itself.
By the way, the above said scientists had all read the 'Upanishads', the Gnostic scriptures of ancient India. They all acknowledge it.
Anyway, science does not know the Source of this known universe.
In fact, we do not know of the 'father' of our 'mother' atom. All that we the humankind at present have is a speculation. Not a fact.
Of the atom we know that it is the illegitimate 'son' of the 'non-mating' of a non-alive and non-conscious 'virgin' cosmic phenomenon! This bio-chemical 'happening' or atomic-mating is now known as the big bang.
So, who are we, and what is this universe?
The ancient sages, specifically of India, had self-actualized and self-realized as a personal metaphysical self-experience That Which Is. They put on record for us that all seen and unseen phenomenon dissolves and disappears at the end. And it materially and empirically merges indivisibly unto a no-thing-ness and all-ness; of an eternal oneness and an infinite is-ness.
In other words, delving unto the limitless endlessness of the cosmic existence, it is empirically but metaphysically found as an ethereal and eternal truth that at the very end, in absolute reality, there is no atom or energy or a separate entity in existence; which in substratum is 'other' than the Whole as such.
All existence is but a singular and an inviolable, indivisible and an inseparable cosmic unity of the Whole of What Is.
This infinity and eternity - because 'It' is, as it is - casts a shadow, as if.
From the illusory shadow of this 'It' of Which Is and of the Cosmic Absolute, emanates the ethereal potential of manifestation.
It, in turn, leads to the making of an illusory 'virgin' phenomenon.
As a consequence of it, is brought in the 'birthing' of the unknown and the unseen universe.
An infinitesimal chimera from this 'That-ness', then, is seemingly birthed as this seen and the known universe.
Being birthed from the Source of Infinite Eternity and Unity of Forever-ness, the 'sired' - that is us, and the universe - may be said to be as the Maker.
Hence, each and everything is in the 'make' of the Absolute.
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