You misunderstand the idea of scientific theory. It's not just a guess as you suggest. It is based on empirical evidence. After a century it is now accepted ( although I see you found the rare individual who argues your point ) as scientific fact. Just like gravity and every other fact that verifies the existence of the physical universe. Your opinion is just that an opinion.
Yeah.......IMPERIAL EVIDENCE that is not sufficient enough to be a FACT/TRUTH of science. Theories are ideas....regardless of what they are based upon, A theory is not a FACT of SCIENCE. Funny:

You just presented an OPINION and charge someone else of engaging opinion. This is called psychological projection: Typical of a secular humanist, project your faults onto others, its a psychological defense mechanism whereby unenviable or unpleasant traits, impulses or ideas are attributed to others instead of SELF.
Science.........real science, APPLIED SCIENCE is defined by Websters College Dictionary as: Knowledge covering general TRUTHS or the operation of general LAWS. Again, a theory is not a law/fact of science.
One simple question will clear all this BIG BANG is FACT BS.........where did the energy come from that produced this COSMIC EGG that supposedly exploded? Are you attempting to sell the dogma that it created itself from nothing? There is a LAW OF PHYSICS called the Law of Causality....aka, the Law of Cause and Effect: This law of physics states that every material effect (such as the creation of the universe and your BIG BANG) MUST HAVE AN ADEQUATE ANTECEDENT (preceding) or simultaneous cause. In other words........the Universe or the Cosmic egg of energy that supposedly created everything ........................by the nature of the laws of physics, must have a superior CAUSE. It did not magically create itself.....it had a cause, and whatever that cause, ITS SUPERIOR TO THE NATURAL LAWS OF PHYSICS. aka, Supernatural
Easy Peasy as clearly you are superior in intelligence to that of Stephen Hawking.......who offered this conclusion: The universe created itself from NOTHING. Gravity caused it. Sad, but gravity is someone that is measurable and quantifiable in a factual manner via observing its potential, the first law of the Scientific Method......OBSERVATION. Physics prove if you begin with -0- NOTHING, nothing is all that you will have. NOW THIS IS NOT OPINION........Hawking was dealing with DOGMA not science to even suggest that something can be created from nothing void of a superior cause.
Logically.....If science cannot answer the question about the origins of the Universe...then that CAUSE was Super (superior) Natural (to nature).
Carl Sagan said it like this: "Science (theoretical science) IS A WAY OF THINKING (in other words its PHILOSOPHY), its a never ending error correcting process (yet you claim there is no error in theory?) by which we figure out (again figure out?) what's true and what's not." -- Carl Sagan. In other words......a theory will stand as truth for the scientific theorist until someone comes up with a better truth............ But........truth does not change or it was never truth in the beginning.
Truth is not debatable ...........the very fact that you are being challenged via the laws of physics proves that THERE IS NO TRUTH.....only speculation.....better known as YOUR OPINION