Many people are hesitant to identify as atheists because of the social stigma they may face, making it hard to pinpoint connections and differences among this group.
Which is quite fascinating since he's made it very obvious that he himself doesn't know jack shit about Christianity and that he's not a believer. I'm an atheist myself and I've never seen a person more lost and uninterested when speaking about Christianity than him.
Really reminds me of the Association of German National Jews and their sad decision to endorse Adolf Hitler. We're frequently presented with the assertion that people, in-general, are rational when they evidentially are not.