a way to look at the bible is this. the bible is a collections of peoples viewpoints. yes it is based on historical documents that do exist, but what admin is trying to say with the roman records is the dead sea scrolls etc are written by people glorifying the person they believe to be thier savior. so in such as saying no documentation is around to prove jesus, adam/eve etc, i take it as there is no unbiased documentation such as roman recordings of the crucifixions. we know those to be unbiased because its straight fact ie john doe, crucified friday 24th, crime: theft.
as responce to the historical proof of timeline etc of the bible, yes we know jerusalum and nazareth existed. that is not argued. what is argued is the all mighty and his son who was sent to save us.
also, in questioning the bible, you also invertently question the quaran as the quaran does speak of jesus so questioning jesus also questions its validity as well as the bibles.