Are Atheists biased or just uninformed?

I'm still waiting for the proof that the shroud is actually over 2000 years old, since there is no "forensic evidence" that proves it. This is no different than the Chapel of Saint Mary of Zion in Axum, Ethiopia. They claim to have the ark of the covenant in their chapel but, of course, no one except for the high priest of their church is ever, under any circumstances, allowed inside to see.