Lancer,   they can't.

No people back then, 13.x billion years ago.

Theoretical Origin Astrophysics is about as theoretical as it can get.

Some theory that is closer to real is gravitonics and gravity waves coming from twinned close co-orbiting black holes, the resulting gravity waves so strong you can see the ripples expressed in nearby star masses and gas fields and associated type objects.

Now, considering you are looking at light that is hundreds of thousands of years old, how relevant is this to our current reality is something else to consider.

Jesus is a lot closer to relevant, being only 2023 years ago and having left more physical traces to study.

Jesus was the "big bang" in human history.

His conversion front covered known humanity inside a few hundred years.

He left rippling gravity waves too ......  ripples that we still see rolling through mankind.

Before Jesus on earth, yes.
Their existence and time and space, no, since He, the only Eternal Sovereign God, The Alpha and The Omega, proceeds everything He created and has absolute control all things all of the time.

Best I can tell humans existed outside the Garden of Eden. Otherwise God would not have needed to mark Cain,so people didn't do anything to him.

https://www.youtube.com/watch?v=kSJ7F7ckhPM&ab_channel=AstralicaSpace

OK, a singular Big Bang isn't a currently trusted theory any longer.  

Haven't got a clue of what replaces it yet ....... but some hints are coming in now.



They can see very clearly well over 20 billion years into the past now .....  and they see lots of old stars populating very old galaxies way way out as far as they can see.

They question if they are from "other big bangs" as that is a potential explanation of what they can currently see.   Now does this theory also offer a place as to where all the sun matter and dust matter goes when it get sucked into a black hole?  

Does it come out of a white hole that constitutes the big bang event of a new area ????



https://www.youtube.com/watch?v=qGmqvyouEdI&ab_channel=SpaceWind

How many big bangs would it take to populate what we can see now?   A couple of dozen bangs would suffice for what we can see locally right now, but efforts to "de-fuzzy" some of the large very fuzzy supergalaxy looking edge items is likely to resolve into even more much older supergalaxy areas each with its own bang.  

Multiple bangs (each with local space time expansion) seems to hold as the current best theory as the "starts as a hot dense state" seems to hold AS A LOCAL EXPANDING SPACE TIME CREATION PHENOMENA.

And yes, James Webb can currently see what may be about 50 brand new big bang driven space time "super galaxy" formations with lots & lots & lots of unmodified empty virgin area between the populated space time areas.

Creation is a whole lot bigger than what we used to think it was ......

https://www.youtube.com/watch?v=iBMRGYKvuHk&ab_channel=Orbit-BeyondtheBlue

https://www.youtube.com/watch?v=GjgFR33-v-I&t=34s&ab_channel=StarTalk

 

Wow !

All that stuff was before my time , but I can say that : I"ve read this or that , but I don't know for sure.

I do think the "Gap Theory of Creation" is the most probable.  Just from reasoning things out.
Thinking we can "KNOW FOR SURE" how the universe started seems highly unlikely to me.
Not that it ain't FUN to speculate on "How it all Started"  

https://www.youtube.com/results?search_query=lights+showing+on+other+planets

https://www.youtube.com/watch?v=kfw__8RCHCk

https://www.youtube.com/watch?v=V0Hy-GADxeI&ab_channel=Voyager



Well, James Webb has captured a relatively nearby world Proxima B that has constantly glowing (not sporadic lightning effects) lights showing up on the night side of the planet.