Yup, IIRC, in the God Delusion, Dawkins talks about a belief spectrum. The spectrum ranges from 1 thru 7 where 1 is a strong theist who believes and knows there is a God and 7 is a strong Atheist who knows there is no God. Dawkins mentions he is a 6 (low probability of a God, doesn't know for sure but chooses to live on the assumption that there is no God) and leaning toward 7.