Yes, you kind of do, because 'atheist' or even 'atheist sperg' doesn't automatically equal 'hates the US'.
Your post kind of confuses me. Agnostic and atheist are two completely different things, so which is he? Maybe you can go into more detail in your intro post? I can see in a few of his posts he identifies as agnostic so where does the atheist label come from?
Like several other people here, I'm an atheist but I can't abide by militant atheism. I find it kind of ironic because when you become militant you're basically turning atheism into a religion and giving exactly the same kinds of arguments zealots give. It's embarrassing.