Any truth is absolute truth. If it wasn't absolutely true, it wouldn't be truth.
Do coins with King Ahaz's name on them count as my "opinion"?
Sure it does. It's merely your opinion that they're authentic. How do you know the archeologists didn't make up the coins?
It's not like there haven't been frauds and hoaxes in science before... cough *archaeoraptor* cough...
That sounds eerily like that religious sophism "if man was meant to fly, God would have given him wings." The world is not that cut and dry. There are many levels of truth, like peeling an onion, and there is relative truth as well.
It's merely your opinion that they're authentic
You mean like the Bible?
How do you know the archeologists didn't make up the coins?
The same way we can tell the biblical manuscripts were not written yesterday.