Observation can not have happened in the past so its still blind faith in man's interpretation. That interpretation is based on their worldview.
Look at climate science it's just as corrupt.
All science of today is corrupt because of the worldview pushed on science.
Let's say you see a gif that gives a short animated series of a rack of pool balls after being struck by a cue ball. And you know next to nothing about pool. Since the sequence starts after the rack was struck there's no way to observe how the balls got set into motion.
Someone might come along and say the hand of Isfet, God of disorder, caused the cue balls to be set into motion. I used the Egyptian god for illustration so as not to be blasphemous with the God of Abraham.
Anyway, a scientist who is good at math and physics, studies the sequence, and using math and physics, calculates the likely path of the cue ball and determines that it must have struck the balls and caused them to react the way they did. Then, several other scientists, all good at math and physics, reviews the first scientists conclusions, one of whom says, uh, you forgot a sign. The cue ball did strike the rack of balls, but it struck it here, instead of there.
Both examples used current observations. One used religious beliefs to determine a cause consistent with those beliefs. The other used tools to extrapolate what must have happened based on what's known about the math and physics of what was observed.
That's a simplified explanation of the big bang theory. Not that a giant cue ball struck whatever was the beginning of the universe and splatted it all over the place. But. It looks like the universe is expanding. Okay so expanding from what? Something. What caused it? They don't know. So they use the "big bang" terminology as shorthand for the thing they think must have caused it? And maybe their math is wrong.
We probably have an incomplete idea. Webb telescope is both proving and disproving many theories. And maybe some scientist will stumble across some new physical evidence that changes the math. And maybe the new math will make the earth look a lot younger. I doubt it. But in an unknown domain, everything not known is possible. There may be a God. God may have sent his son to save the world. Or. Maybe the heavenly bodies are pool balls on a really complicated pool table.