For me, atheism and agnosticism are about different things. Thus, I describe myself as an agnostic atheist. Atheism/theism is about what a person believes. If s/he is convinced that there is a god (or gods), s/he is a theist. If not, s/he is an atheist. Agnosticism, on the other hand, is an opinion or stance concerning the importance of evidence. It is the idea that we shouldn't be convinced of something unless and until there is sufficient evidence to justify the belief. It is possible to be an agnostic theist, just as it is possible to be an agnostic atheist. An agnostic theist would be a person who is convinced that God exists and who also believes there is sufficient evidence to warrant that belief.