If you don't believe it's possible to know anything with 100% certainty (agnostic viewpoint), how can you say with such force, "It doesn't," (gnostic viewpoint) in regard to whether or not anything like God exists?

Maybe it's important to keep on expressing highly probable beliefs with the force of fact, but I think that undercuts any sort of agnostic viewpoint.

The most important question for me isn't the search for the truth - it's what certain assumptions about the truth mean for a person.  What does a person without 100% certainty in anything look like?  What does a person with a strong belief that nothing like God exists look like?  And what kind of person do you want to be?  And (most interesting), what does the internal conflict between these two types of beliefs look like in a person?  These questions seem far more relevant and interesting to me...but that's just me.