Whoa.
From the beggining;
Says that Bilical folks say that the Hittites existed, so the bible MUST be a valid source. Even if, as you say, the hittites being referanced to are not the same hittites that have been dug up, does this create a validity? Its an Ad Hoc relationship: if A comes before B, then A caused B. The two events are unrelated (the existance of the Hittites and the validity of the bible) and just because the bible mentions the Hittites, who may or may not have existed, that does not prove the entire Bible true or false.
I believe in God, I just call it Nature