So, you are left with exercising good judgement, whether a report is true, half-true or false. And you have to allow for the benefit of the doubt. Take for example Josephus' testimony on Daniel. Do you accept it as fact or fiction:
Nope, not an option for you. A key component of science is "observation". That's no longer an option for you. Their reports and observations can't be allowed in. Everything you are describing is using science. You just said that is NOT valid, you need to find another way.
Josephus (ca. 100 CE) would view Daniel as “one of the greatest prophets,” because not only did he prophesy future things, but he also fixed the time during which these would come to pass.
Yes, but science (which you can't use in any way) clearly shows Daniel was written over the years in parts and pieces by different people.