The reason we don't know is that we live by faith and belief. In other words, we are religious beings, and live religious lives.
Some of us trust God, so
we know by faith. No big crunch. No big bang. Destruction of this universe soon. But loss of this universe to all of us when we die.

Do you think faith is a reliable way to discover what is true and what is false? Have you examined all the principles and application of all - or at least most - science? Or do you have faith in scientists and the media, that they are telling you the truth?

Yes, I did, for the most part. But
that was not the question.When you have and understand the evidence you don't need faith.
You, on the other hand, are like a lost lamb in the woods, to be chewed up and converted to a pile of manure
by any pack of wolves (priests) that comes along.
If there is one scientist in the world who lies, there will be thousands who will expose him/her in a New York minute. Science is the only way we know to get to the objective truth. Their results are checked over and over. Every graduate or post-graduate student wants to invalidate previous scientific results and make a name for himself/herself.
But to you it means nothing, nonsensical words scribbled down by anonymous goat herders, who knows when and where, translated and mistranslated by hundreds of other scribes, added and modified millennia later by some old men with pointy hats, those words mean everything. You accept them without any examination or evidence. Study other Bronze Age, prior and later myths, you'll understand the parallels and the reasons why the Bible was written. Study high-school Physics, Biology, Chemistry, you'll understand why the Bible content is pure, unadulterated scientific nonsense.
Your rejection of science is revolting.
I think people like you are interesting study subjects, Psychologists and Psychiatrists should study you to figure out which part of your brain is affected by your delusion.
You are a sad, broken toy, donated to one church, now passed around like a $5 crack whore.