A Christian believes that there's 100% (1) possibility that there is a God.
An Atheist believes that there's 0% (0) possibility that there is a God.
The perfectly balanced agnostic feel's that there's a 50% (0.5) possibility that God exists. Various environmental factors cause agnostics to to lean to one side or the other, and possibly round to the nearest integer.
What's your current number?
I think I'm currently a 0.3.