Ace takes a fellow atheist to task for his sin - Vanity.
You are guilty not of atheism (which is not a crime) but the great sin of our age, the great Vanity, that of Tribalism.
You believe that your membership in a tribe makes you superior to others; I think your devotion to a tribe makes you inferior.
You are desperately searching for affirmation of self in trivial proofs. I believe this, I don't believe that; ergo, I'm superior.
You might as well be basing your ego upon your favorite ice cream flavor.
The teacher had it right all those years ago.