agnostic \ag-nas-tik\ adj [Gk agnostos unknown, unknowable, fr. a- un- + gnostos known] : of or relating to the belief that the existence of any ultimate reality (as God) is unknown and prob. unknowable agnostic n agnosticism \-nas-te-si-zem\ n
(C) 1995 Zane Publishing, Inc. The Merriam-Webster Dictionary (C) 1994 by Merriam-Webster, Incorporated
It's difficult to respect someone who asserts that they are an atheist, that they reasonably deny that which they have no way to prove does or does not exist, in light of the more reasonable definition of agnostic, one who acknowledges that for them the proof is unknown and possibly unknowable. That's why I characterize your assertion as sad. Not because I am a Christian, for that is also a belief based on faith, a belief characterized by hope ... as opposed to arrogant assertion that one knows that which cannot be proven to be known and one has chsoen to assert despite human limitations.