Timeless epistemology

Can unbelievers know truth? The whole question has been distorted by failing to ask, Which unbelievers? In what circumstances? In what stage of unbelief? The New Testament shows the Jews who reject Jesus as blind, but also shows them being blinded, or blinding themselves. To give a zero-sum answer to the question of the knowledge of unbelievers is to give a timeless answer. But unbelievers aren’t timeless, so any zero-sum answer is pretty useless.