The only thing they seem to all agree on is, God had nothing to do with it but they cannot prove what happened, "in the beginning".
I don't know what you do for a living, so I don't know what education or qualification you took to learn them.
So I am going to give you some hypothetical examples, or what we call analogy.
Let's say you became plumber. Where would you learn this trade? From another plumber, qualified and experienced? Or did you learn the plumbing trade from god?
There are no mention of God telling you how fix leak or replace pipe.
My points are that you don't learn anything from God for becoming plumber, electrician, construction worker, or any other apprentice-trades. And if they have manuals, where they mentioned "God" as parts of their training.
Similarly, there are no mention of "God" in accounting textbooks, where God teach people how to balance the books, or auditing people's or company's gross profits, credits and debits and spendings for tax purposes.
If none of these trades or non-scientific professions required acquiring knowledge from god to their work, then why should any scientific branches or fields would require to inform people learning science about god.
God is irrelevant because God cannot teach anyone science that are required to do their jobs.
Science is a tool to acquire knowledge of WHAT nature is, HOW nature work or function and HOW to make use of this knowledge (hence application)?
In order for you God into anything relating to science, then God himself needs to be falsifiable and testable.
- Can you test God's existence?
- Can you observe or detect God?
- Can you quantify or measure him?
If you answer no to each question, then why any scientist require to include god in their theories?
If you answer "no" to all of the above questions, then god is not detectable, not measurable, and therefore not falsifiable and not testable - ergo god isn't scientific.
Adding God to any BB model (there are actually two versions of the Big Bang, inflationary and non-inflationary models) or any other physical cosmologies, will not make anyone understand how the universe formed into what it is today.
How did the star formed?
If you say God did it, how does that make understand what a star is? Does the bible or any other religious scriptures show what the stars are and how they work?
In Genesis 1, on the 4th day of creation, god supposedly created the sun, moon and stars, so it is making assumptions the sun is different from stars.
Astronomy showed that the sun is a star. Astrophysics show why and how light and heated are created from the Stellar Nucleosynthesis.
Stellar Nucleosynthesis is how the star create heavier element (like helium) from lighter element (like hydrogen), through nuclear fusion. It takes about at least 6 hydrogen atoms to create a single helium atom.
When a star run out of hydrogen atoms to fuse into helium, if the star has enough mass, and higher temperature than before, it would begin to fuse helium atoms into heavier elements, like carbon, nitrogen, oxygen or any other elements in between these elements and iron element.
That's how star create heavier elements to make new planets when the star died.
The bible cannot teach anyone anything about the stars, and what the bible do have to say about the stars, are just superstitions, not science.
So unless the bible become knowledge for science, it cannot teach us anything except believing biblical stories, which have nothing to do with science.
So why would expect science to include God in the Big Bang theory?
Can god teach us about what atom is?
Or what quark or lepton?
Can god teach anyone about mass, energy or field?
Can god teach us gravity?
Saying "God did it" to any of the above question, is really not an answer, but lazy cop-out and pure ignorance.
Science may not know everything to know about nature, but it is far better than Genesis 1 to 11, or anything God said in Job 38 to 41.