motivations?

is things like THIS that make me curious why some (and herein i am referring to 'pushy' atheists) atheists find it so necessary to press their claim that there is no God. i struggle to think of any other situation like this where someone or some group feels the need to press so hard against the belief of something. i wonder about the motivations of pushy atheists. maybe i should make a shirt that says 'i don't believe in atheists' -- and see what they have to say about that...

article HERE.