The the words speak for themselves. I'm not sure I'm satified with your definition of agnosticism but I could have had the wrong definition of it all this time. Theism (The ism of God) Atheism (the ism of No God) and Agnosticism (The ism of No Knowledge) Agnosticism isn't a belief like theism or atheism, its a comming-to-terms. "I dont know" plain and simple- it doesn't mean that agnostics subscribe to the certanty that the existance of God or the absoence of God will never be known, it simply means it is not known.
Not quite correct, chris. "Atheism" is any belief which is not "theism", it is not a held view point unto itself. There are many different types of atheist, among them the "there is no god" and the "I have no belief in god" stances. Agnosticism is "I cannot know if there is a god", which is subtly different. Someone who is agnostic to the existance of god can be 'theistic' or 'atheistic' in their views. It is independant of theism or atheism.