From J.P. Moreland's answer to comments on the CT blog on his ETS paper, "How Evangelicals Became Over-Committed to the Bible and What Can Be Done About It":
"Does anyone seriously think that non-Christians who have never seen a Bible have no knowledge of God or the moral law?"
Which moral law?
Knowledge gained from archaeological digs is in now way the same as the knowledge of how to be saved. Archaeology (or whatever hard experimental science) will only give you interesting facts. The framework in which they are put comes from somewhere else. You won't get this framework experimentally. Neither will you get a salvation framework experimentally.