Atheism as an Objective Concept; It’s not that a god couldn’t exist, it’s that YOUR god doesn’t exist.
This is a mistake I believe many of my fellow atheists, including quite prominent ones, have been making for years. Atheism should not be treated as a subjective concept, by doing so we fall into the same (il)logical traps as theists. Our motto should not be that a god could not exist, but that there is no evidence to support any of the god theories that have been presented to the world thus far.
Should a theory with verifiable evidence of a god be presented in future (however unlikely), we will happily test it. Meanwhile we can say with confidence that what theists call evidence to support their faith in their respective religions holds no water; We are therefore atheists in regards to Christianity, Islam, the Hebrew religion, Hinduism et al.