73% of Americans are true believers, convinced that God exists beyond a doubt.
87% of Americans are basic believers in the existence of God, saying either that they are convinced that God exists or that God probably exists and they have only a little doubt that this is the case.
3% of Americans can be considered to be hard-core atheists convinced that God does not exist.
4% are agnostics of a sort, leaning toward a belief that God does not exist, but not sure that this is the case beyond a doubt.
Source: Willow Magazine www.willowcreek.com