I don't think that CanuckMA was saying everybody would lose faith if the archaeological evidence for Judaism disappears. But let's not forget that humans are, by nature, historical creatures. We live in history, relate to history to understand ourselves, etc. You might lose all your pictures of your greatgrandparents in a fire but still remember them and how you saw them when you were growing up. You can even share the stories you remember of them with your children. But the feeling of being linked through history with your own family is much stronger if you can produce pictures, heirlooms, etc.
It is similar with Judaism and Christianity. They are decidedly historical religions that are inextricably linked to historical people and events. That is not being based on relics. While each person must decide for themselves whether or not the supernatural claims made warrant an assent of faith, if the historical evidence is disposed of, especially purposefully, then there is going to be a problem.
Pax,
Chris