Exactly. In fact I have huge doubts about the usage of the term "evidence" here: literacy concerns cannot provide evidence on the time the Biblical texts were w

Exactly. In fact I have huge doubts about the usage of the term "evidence" here: literacy concerns cannot provide evidence on the time the Biblical texts were written, they simply shed light on the culture at the time. Real evidence in this context means uncovering early copies, comparing Biblical records of events with other accounts etc.