A person that does not believe in the supremacy of Harry Potter.
Kid 1: Harry Potter is so dumb, it's not even real!
Kid 2: What are you talking about, stop being such a Hatheist.
A person who vocally hates on religious individuals, often criticizing such persons for being uneducated hillbillies.
Phillip: Dude, I can't believe how many people still believe in creationism. What ignorant idiots.
Lewis: Chill, man. Stop being such a freaking hatheist.