Affiliation and belief are two different things. It's possible to be a religious believer but not be affiliated with any organized religious tradition. That happens a lot. And equally, it's possible to be affiliated with a particular religious tradition without believing in its doctrines. I suspect that many Muslims would fit that description. So would the many Jews for whom Judaism is an ethnic identifier and the many Irish Catholics for whom the same is true. As for me, I'm not affiliated with any religious organization. So I'm a 'none' in that regard. As far as beliefs go, I don't believe in the truth of any of the (supposedly) revealed scriptural traditions. I basically think that all of them are false. So I approach atheism in that regard. But then there are the big questions - why is there something rather than nothing?, why is there cosmic order?, what is reality at its most fundamental level?and so on. I don't have the answers, though the questions fascinate me. This is where I part company with the atheists, I guess.