No it's not about the Big Bang.
"Once you start lying, saying you know things you just suspect and cannot prove, the lies just multiply."
Nobody is lying or saying they know things they don't. Scientists have proposed ideas. That's how science works. Nobody is saying these ideas are facts. That's precisely the point.
When they assume the existence of something they cannot prove, that’s not science, it’s a belief system.
I have 2 degrees in science, and almost a 3rd.
I believe in provable science, not belief. For example, everybody was all hot about string theory for 20 years or so, and it never had any real underpinning. Now, it’s out of vogue. Not that there is anything wrong with changing your views if you get new information, but they move from one supposition to the next.
Like weathermen, they never admit they were wrong.