I don't have a strong opinion on the age of biblical scripture.
I'm willing to concede that Exodus or Deuteronomy was written 3,000 years ago if the evidence indicates.
But what shall we do with the text? If we ascertain some meaning we might like to apply to modern life, what system of philosophy or logic will enable us to verify that meaning? The Bible says to stone to death a stubborn and rebellious child who has grown up to be a drunkard and a glutton (Deuteronomy 21:18-21). What method enables us to determine whether this is sound advice for us here and now?
If you possess such a system, I doubt that we need the text for moral guidance.
If you lack such a system, and instead propose to rely on tradition or divine inspiration, there are other traditions and other purported divine inspirations. By what criteria should we select among them?
On the other hand if the text is meant to be taken as "ordinary" history, a simple factual recounting of events like any other, then the supernatural events cast doubt on the authenticity of many details if not the whole narrative.