Wow. What a succinct way to put it. I've had raging arguments with atheists on FR on the impossibility of atheism.
You summed it up in a single sentence.
Generally, I get riled and ask them to lay out their proof for me so that I can have my Sunday's back.
I never get a response, but my approach isn't half as elegant as your summation.
Atheism is a religion too. To say you know there is no God is logically the same as saying you know there is.
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If your God is logical
-- reason is your religion.
To say then you know God, is not reasonable.
To which "God", out of the thousands worshipped throughout human history, do you refer, and why is lacking belief in an entity that is entirely an unsupported assertion as logical as believing in an entity that is an entirely unsupported assertion?
"Atheism is a religion too. To say you know there is no God is logically the same as saying you know there is."
Essentially I agree, and have always thought this way myself.