He probably isn't. Most religious people think it is their duty to be self-righteous bigoted assholes. How can any system of belief that characterizes non believers as evil wastes of space produce anything but assholes?
I wasn't even going there - I'm not that strong of an atheist. I consider myself agnostic, mostly because I really don't give a fuck what people believe in as long as it stays out of public policy.
The monotheistic belief include the doctrine that it has to be public policy.