There's been a recent push to change the definition of "big bang", just as with changing the definition of countless other words to suit the will of dialectical materialism. This past month I've come across a new video† by a very popular youtube channel and an article on a popular website talk about "what happened before the big bang" and "why the big bang wasn't the start of everything".
Just as "nothing" no longer means absolutely nothing, it means "the ground state of the quantum vacuum", now the "big bang" isn't what it always has meant, when time, space, matter, and energy all came into existence from absolutely nothing, now it means "inflation", which happened 10^-32 seconds AFTER what was previously defined as the big bang. This is a devious little reach around to claim that "stuff happened before the big bang", just like calling "the ground state of the quantum vacuum" "nothing" allows you to say that ""science" (dialectical materialism) can explain how the universe was created from nothing without God."
Eternal inflation, the idea that the inflation that sped up the expansion of the early universe didnt' stop, it still continues in other regions of space beyond our cosmic horizon, spawning new bubble universes forever, was the first to go. Some thought inflation was eternal into the past too, but in 2003 Vilenkin and Alan Guth ran the calculations on Hubble's Constant and found that it doesn't work. Inflation may continue forever into the future, but it had to have a beginning in the past.
Next came the big bounce, the idea that after a long time, a trillion years or so, expansion slows and stops, eventually reversing until everything flys back into a single point called the Big Crunch. Then the shock of impact of everything on everything starts a new Big Bang, and the cycle continues forever. Unfortunately, disorder increases with time, so each new universe must be more disordered than the one that birthed it. If the cycle had been going on forever disorder would be infinite and the universe would be completely featureless. Since there's stuff in the universe the cycles couldn't have gone on forever. Some people then suggested that the universe just gets bigger with each bounce, so the disorder spreads out more so no one notices it (like in the M-Brane ekpyrotic model and possibly whatever the hell Penrose's new idea is - no one seems to understand his Aeons of time model, within the physics community or anywhere). But if the whole thing is getting bigger it had to start somewhere really really small, maximally small, and that means a finite beginning.
There's also an idea from the 1930s called the cosmic egg or primeval atom, where yes, there was a Big Bang 13.7 billion years ago, but the thing that banged was an uber-dense subatomic thing that existed forever until it got tired of existing as a tiny little particle and exploded. However, Vilenkin and a graduate student Audrey Mithani showed that quantum instability would have led to the egg's collapse after a finite time. The crack (the Big Bang) had to happen before the egg collapsed into oblivion so it couldn't have existed forever, even if it existed for a really, really long time before the Big Bang.
Here are several prior pieces I've written on why inflation cannot be past eternal:
Balking Hawking Part 1
Balking Hawking Part 2
Georg Cantor's Infinities (Part Two)
Balking Hawking Part 3: In The Beginning
Make no mistake, when people say "science says" they mean "dialectical materialism says". Science does not say anything, science does not prove anything, individual scientists may say things, but science is not a catalogue of facts, science is a process.
I've made a video many years ago back when I used to make videos called "First Principle Anecdota"* that everything you know, and every conceivable system for attaining knowledge (that is, all forms of epistemology) necessarily relies on what are called "axioms" or "first principles", which are assumptions which must be taken as given but can never be proven true. At its base you can NEVER know anything about the world with absolute certainty. Everything must be based on things which you assume to be true but can never prove. Based on those assumptions you can create a system to demonstrate facts with arbitrary certainty, but the certainty of those facts is always arbitrary and is based entirely on your assumptions.
I've probably talked to hundreds of people about this and no one seems to get it. Not the "praise science" crowd who believe in dialectical materialism. It's like people can get arbitrarily smart, but their smartness is always asymptotic to the level of intelligence needed to realize that all knowledge is built upon unprovable assumptions.
Ordinary people, who are just smart enough to be dangerous, are easy to trick by these linguistic gymnastics like redefining words. You redefine "big bang" and "nothing" and get disaffected teenagers into becoming atheists. That's how they get you. Meanwhile the geniuses (technically the plural is genii), the real hard-nosed intellectual atheists who really look into the subjects like Anthony Flew, turn to belief in God because they realize that the universe and life are far too complex to be explainable by any series of coincidences.
I said a few years ago, somewhat tongue-in-cheek, "How do you change a cow into a horse? You redefine the word "horse" to include cows."
That's really what we've been seeing this past decade go into overdrive as the Fabian socialists who run the West have taken to redefining words as a form of mind control and behavior modification.
*By the way, my videos tend to have very specific titles, and if you search that in quotes mine will appear as the first result. I know Google has algoreithms that skew results to be more in line with previous searches, but I've never searched for that video before, so it's as close to neutral as you can get.
†That video that claimed inflation is the big bang is predicated on a lie. Most people do not watch videos to the end, and at the very end they admitted that inflation does not explain the initial state of the universe (what has always been referred to as the big bang). The video admitted at the very end that everything was a lie knowing almost no one will watch to the end.
This is just like how the New York Times will deliberately publish articles with provocative titles and then in paragraph 6 they will give the truth knowing no one will read that far into the article. An article may be titled "Trump Hates Brown People" and the article may have nothing to do with Trump except at the very end there might be a quote from some race baiter which says "Ralph Sharpman said in interview that "Trump hates brown people."" The NYT will run with that quote, and put it in quotations, but not tell you it's a quote from someone else or tell you the article is about Ralph Sharpman until the very end.
This is how they can technically not be lying outright but still be lying by saying something true in a misleading way. It's lying because it omits the context of the original statement.