Just to clear it up for the abnormally handicapped among you, there is a huge difference between 'I do not assert God exists (exactly the same as saying I don't believe in a god)' and 'I assert God does not exist (exactly the same as saying 'I believe there is no god'.)
One is an assertion, the other simply isn't. Atheism just means you do not assert there are any deities in existence. Regardless of your beliefs, this is not something you can get wrong and expect to be taken seriously.