ICOT, I respectfully disagree with you.
There is a reason we say “I believe” not “I know.”
I’ve learnt through just about all logical proofs of Torah Judaism and not one can really hold water. There is always room for speculation and doubt – that’s why there is bechirah. We choose to believe as a nation.
So yes, I believe the information passed down from my ancestors is true. I don’t believe they had a reason to lie. But I cannot prove it.