@mike2R: presumption unsupported by evidence
"But your normal atheist will say "I believe there is no God" in the same way he would say "I believe that your asthmatic three-legged horse will not win the Grand National". It isn't a statement of faith, simply an opinion on probability."
Those who use the term "probability" or "improbability" to justify a proposition as "reasonable" should be asked either:
a. to demonstrate how they calculated their number close to zero (if improbable) or close to one (if probable), showing assumptions, formulae, computations and method
b. or they can't begin to do this so they should admit that they really don't know.