It’s not philosophical, it’s incorrect.

https://www.atheists.org/activism/resources/about-atheism/

The Simpsons

And if you own a house that is being flooded, just sell the flooded house and move you fucking idiot.

Atheism just means that you have yet to find a reason to believe in God or some higher power. It is not a belief system, it is a lack of reason to believe in any belief system.