Why Agnostic?

[Ryft]

1. Do you believe there is a god in any form?
A. yes = theist
B. no = atheist

2. Do you make your assertion from personal knowledge?
A. yes = gnostic
B. no = agnostic

I try to reduce things down so I could explain them to a 13 year old.

What am I missing?
Rhizo

First, a fideist would answer both questions with a 'yes', but they would insist (rightly) that they are agnostic—since for them knowledge about God is personal and subjective only; i.e., they cannot communicate anything about God to someone else in any way other than describing their own personal experiences with him (cf. Soren Kierkegaard). And no, a fideist does not ascribe to "secret knowledge" about God a la Gnosticism; merely that their knowledge about God is entirely subjective.

Second, 'gnostic' is used with a lower-case to distinguish it as

c.1585, from L.L. gnosticus, from Late Gk. gnostikos, noun use of adj. gnostikos "knowing, able to discern," from gnostos "knowable," from gignoskein "to learn, to come to know" (see know) ... The adj. meaning "relating to knowledge" (with lower-case g-) is from 1656.

I'm gnostic about the God of the Old Testament. We have proven that such events of the Old Testament simply did not take place (6-day creation, Noah's ark, etc.) and are merely myth. This is knowledge of a certain God's non-existence.

Not to quibble, but... this holds only if non-literal interpretations of such events create a logical contradiction in relation to God's existence, which is not apparent on the face of it. Is there a hidden premise? Otherwise, if there is no logical contradiction, then it is possible that God exists and such stories are allegorical.