@fresco,
The 'something' is genuine, credible, ie strong, evidence that can be evaluated by others. Now you'll ask me to define evidence? In this context, I'm not out to push the envelope with regards to semantics, so standard dictionary definitions suffice here.
Just to clarify, I'm not of the illusion that inferential (scientific) knowledge is eternally incontrovertible; obiously it isn't. I only intend to point out that it's proven to be a lot better than going with just anything people claim
sans evidence. In the present context, scriptures are the claims, not the evidence.