I always thought Gnosticism was tied to one or the other. You couldn't simply be agnostic... Gnostic meaning knowledge. i.e. Agnostic Atheist meaning you don't claim to know, but do not believe in god/s. Agnostic theist, you do not know, but believe there is god/s.
Otherwise good video, short, to the point, and even a creationist could understand.... although they would obviously choose not to.