I have never understood the difference between weak and strong atheism. Either I think God probably exists or that he probably doesn't, but what's the difference between lack of belief in a proposition and a belief in its converse? Is it that, say, who thinks that God doesn't exist with p=0.8 is a weak atheist while with p=1-10^(-9) he would be a strong one? Or is a weak atheist only who has suspended judgement (what's the difference from an agnostic, then)?