>>19
Your unicorn and last Thurday examples I'm almost completely convinced are totally false, but strictly speaking there's a miniscule possibility they could be true. There's not a large enough element of doubt to say I'm agnostic on their existance though. There is a larger element of doubt about the lack of God's existance though. I'd say I'm agnostic with a strong inclination towards atheism. I believe the terms overlap, depending on how strong your convictions are. Russel also described himself both as agnostic and atheist.
Since you yourself admit in a roundabout way a God is strictly possible, you don't fall into the category of atheists I reject; those who say they are absolutely 100% certain God does not and cannot exist.