What is Your Approach?

[CleanShavenJesus]

Historical evidence becomes less and less accurate the further you go in the past.

This is not a bad statement, but there is a science to preserving historical evidence, and to verifying if evidence has been preserved properly. For manuscripts, this is known as textual criticism.
While it can be argued theory that the Bible would become less reliable in enough time, we still have enough right now that it is reliable, and that problem has now been circumnavigated by modern technology. If you wish to know more I can give you sources that are more reliable than I, and more credible.

Reliable for what? To be used as historical evidence? Not a chance.