Ken: "There is no scientific theory that claims a time in history when absolutely nothing physically existed."
Ken, you don't even seem to know what constitutes as being the physical, nor what science's overwhelming consensus is about when the physical began to exist. As before the big bang, there was NO physical matter - not even particles. You just don't believe what science has widely asserted (From Cornell University): "In the beginning, there was not yet any matter." http://curious.astro.cornell.edu/about-us/101-the-universe/cosmology-and-the-big-bang/general-questions/570-where-did-the-matter-in-the-universe-come-from-intermediate
From LiveScience.com (https://www.livescience.com/46506-states-of-matter.html): "Matter is the “stuff” of the universe — the atoms, molecules and ions that make up all physical substances. Matter is anything that has mass and takes up space." And ALL of these did not exist before the BB began!
Ah, but what is matter? Wikipedia: "https://en.wikipedia.org/wiki/Matter": "Matter is any substance that has mass and takes up space BY HAVING VOLUME. This includes atoms and anything made up of these, but NOT other energy phenomena or waves such as light or sound. More generally, however, in (modern) physics, matter is not a fundamental concept because a universal definition of it is elusive; for example, the elementary constituents of atoms may be point particles, each having NO volume individually.
(Big Bang's first moments, 0 second to 10-43 second: We know only that point that at least 9 dimensions of space existed as what is called singularity. All of the universe-to-be existed as a point of NO volume.
Also, NO atoms, pre-Big Bang! Neither were there quarks, anti-quarks or electrons. And only after the quarks and anti-quarks came into existence and began combining and annihilating each other, did the remaining quarks begin to make up ALL the matter that exists in the universe. No matter, Ken (Wikipedia: "Matter is itself a PHYSICAL substance of which systems may be composed) and you have NOTHING physical - as, pre-BB, "There was not yet any matter." How in denial can you be? It's just that you don't even believe what science states, and many, many studies and tests have correlated to substantiate, with a very high degree of certainty.
So, Ken, what do you call the physical - if it has no volume, no matter, no particles, no atoms???!!! Science says without these things, there is NO physical. And that is the state is also says the universe was in before the Big Bang began!