We can't prove that the universe exists because of a "big bang". Scientists theorize this because of the expansion of the universe. We also have only been able to track celestial movement on this scale for less than 100 years... for all we know, the universe expands and contracts on a regular interval. It could be 200, 200 thousand, or a number we can't even calculate to.
So in that, we've already shot the "universe has a beginning" assertion.
Also, using the old "cause and effect" adage: you can't look at a tidal wave and disregard the role of the butterfly. Just because you can't measure or observe something, doesn't mean it doesn't exist. There was a time with no electron microscopes, but those particles sure existed. If you took something as simple as a battery back in time as recent as maybe 200 years, you'd have been heralded as God, or burned as a witch, depending on your geographic location. The point is, the absense of calculable data to explain causation or existense of a certain thing does not indicate divine influence. I don't know myself, exactly, how a car is created. Sure, i'm aware of all the parts, but i'll be damned If I personally have any clue how it all comes together to make a car. Taking that the universe did "bang" or somehow come about rather than having "aways existed", there may well have been a host of factors that drove its creation... and we simply don't have the ability to know for sure.
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