Based on some of the things you have said, you are more than just "full atheist." You've crossed the Rubicon into nihilism.
I am personally of the view that the logical consequence of all atheism is nihilism (at least that's where I ended up when I was an atheist in college), so, even though I disagree with you strongly, I have to give you credit for arriving there, even if you seem to have sort of backdoored your way into it based on your presuppositions of biological materialism (which, by the way, is the same way I arrived there in college too, with a healthy dose of Neitszche for good measure).
My prior post was focused on weakness because it plainly takes a certain strength of will to be able to look into the face of nothingness and, rather than be crushed by the meaningless of it, continue to put one meaningless and purposeless foot in front of the other. The foot is there by biological accident, and the brain that moves it too, but on some level there is a "you" in there somewhere that has to decide to move it. I have found that very few people have the strength of will to examine themselves, let alone walk away triumphant when they realize there is nothing else there.