re: Do you accept the notion of the Big Bang as the origin of our universe?

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The proven part to the best of my knowledge doesn’t go back to t=0 though and that’s where a lot of the questions about it from doubters arise. Our models and equations track it back to a tiny fraction of a second after, but we don’t have a unifying theory yet to get beck to the absolute beginning.

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To me, our observations of the Universe alone are evidence enough that we began from a single point. That we can see light, in all directions, that began its journey to us more than 13 billion years ago is proof positive that there was once a central point of origin.

While the math ultimately leads to a singularity in the past, I suspect that people like Edward Witten will find the error(s) soon and lead us past the BB and into the pre BB.

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What’s incredible also and what I don’t think a lot of people realize is the speed of the inflation right after. Everything (including spacetime?) expanded outwards to create the vast expanses that we see today in a very short period of time. Question though, would that initial expansion be faster than light? The speed of c wasn’t established until after the Bang?

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The speed-of-light barrier applies only to the movement of matter and energy through space. It has no relevance to space itself, except that perhaps it's space that applies the speed-of-light restriction to matter and energy.

The discovery of the Higgs Boson in 2012 confirmed that the Higgs Field exists and is a physical entity. Space is made up of the Higgs Field and seems to be independent from the field that generates matter and energy. Thus it isn't subject to the speed-of-light restriction itself.