First of all, from what I undersand:
Atheism = Doesn't believe in god
Agnostic = Not sure if believes in god.
Second of all, my belief system, abridged:

I have been trying to figure this out for months, and I may have finally done it. I saw this symbol in a dream, it was in the sky, and each node was filled with a gemstone. I could not remember the colors, save for the sun, moon, black and white ones. Thankfully I did remember those or I would likely still be trying to figure it out.
I see this as a personal symbol, not to be taken as an absolute, even by me. although if you are like me, that probably won't deter you from trying.
My interpretation: The four nodes of the outer cross represent the four energy types. From the top, going clockwise, Subtle, Resonance, Force, and Heat/power. The two larger nodes represent the moon and the sun, sleeping and waking. The twin black and white nodes are a nod to the Yin and Yang, balance.
The Center node represents the connection between the four energy types. Heat and Force, as well as Subtle and Resonance energy are usually used on the dream plane and waking plane respectively, but can be channeled into the opposite plane through the center node, hence the placement of the Sun and Moon nodes.
Balance between waking life, sleeping life, and the energy types appear to be the main message of this symbol.
the energy types seems to be mirrored from the opposite energy type, similar, but different, could it be the same energy in different form?
tl;dr: spinoff of NewAger stuff that I made up myself and is subject to change