No, I have a lack of belief.<quoted text>
Actually, the lack of belief is agnosticism. It is a passive thing. Atheism is a denial, which is not passive, but definitive.
If you get on here prosyletizing atheism, then you have a belief. Which is most definitive.
Don't believe in gods, or unicorns, or elves, or minotaurs....really, the list goes on and on....