A fucking idiot wrote "I dont know whether I'm atheist or agnostic."

If you have to ask then you're not an atheist. 

An atheist is normal. Everyone else is an idiot. 

A real atheist: 100% certain magical beings are not real. Period. 

A wimpy fake atheist: Lack of belief in magical beings. 

The wimpy fake atheists are idiots. Agnostics are idiots. Theists are idiots.