So I guess another thing that bothers me with this is that it has been shown that many people feel they require some form of philosophical underpinning to their lives. Something that they can hold onto and strongly assert. For many religion plays this role. For others Atheism plays the role. In this sense Atheism is indeed a theism. Atheists, me included, strongly assert that there IS no god, in the face of there not being any evidence for or against one. While I agree that Possibilianism is in some way a more logical world view it doesn't fill the emotional and philosophical role that atheism and religion does. And I don't agree that it's ANYWHERE near as close/simple minded as religion. Stating that something as complex and fanciful as a supreme Deity DOES exists despite a total lack of evidence is NOT the same as stating that such a thing does NOT exist despite a lack of evidence. Yes for me atheism is a "belief" one that DOES have emotional and philosophical underpinnings (see existentialism!). I don't feel I'm stupid for holding such a "belief" however.
A possibility you might what to keep open is that the God you don't believe in is not the God that exists. You rejected a God you believe in by defining what you don't believe. The God you don't believe in does not exist.