Is atheism self-contradictory ?

[Astreja]

Assuming no God can be proven by logic, how can one trust his judgment about religions/existence of god if his mind itself cannot be trusted ?

I hope you realize that that applies equally to believers.  If I can't trust my judgment, how can you trust yours?  Theism and atheism are statements of belief, not logic.

Rather than saying something like "I believe that no gods exist," I merely say "I haven't seen any evidence that convinces me, so I'm inclined to think that gods are fictional and I simply can't be bothered to worship fictional beings."