In my previous article, I originally defined atheism as “the rejection of the possibility that ‘God’ exists” because that is how I’ve understood the word from the time I spent studying theodicy (God and the problem of evil). But many “atheist” commenters disagreed with this definition because their self-designation was based on belief statements that didn’t align with my knowledge statement.
This article explains the differences between the viewpoints and the logic behind them.
Atheism is commonly called the belief that there aren’t any gods or the lack of belief in gods. But in a more accurate, philosophical sense, it is the knowledge that gods do not exist. This is easily seen by how an atheist answers the question: “Is there a God?” Belief is irrelevant to the question; knowledge is what’s important—with the only possible responses to be “yes,” “no,” or “I don’t know.”