I think that the religious faith of most average Christians waxes and wanes over time, sometimes even in the course of a day. I do know people whose faith seems to be 100% and rock solid. In the end, I don't find thinking about the topic of strength of faith particularly useful or productive. God is a mystery to me, as is existence itself (and most other things too), but I believe that in prayer and in practice one can come into relationship with God - or at least with Jesus.
Ron Rosenbaum speaks up for the Enlightenment agnostic in everyone: An Agnostic Manifesto - At least we know what we don't know. One quote:
Atheists have no evidence—and certainly no proof!—that science will ever solve the question of why there is something rather than nothing. Just because other difficult-seeming problems have been solved does not mean all difficult problems will always be solved. And so atheists really exist on the same superstitious plane as Thomas Aquinas, who tried to prove by logic the possibility of creation "ex nihilo" (from nothing). His eventual explanation entailed a Supreme Being standing outside of time and space somehow endowing it with existence (and interfering once in a while) without explaining what caused this source of "uncaused causation" to be created in the first place.
This is—or should be—grade-school stuff, but many of the New Atheists seemed to have stopped thinking since their early grade-school science-fair triumphs.
Right, sort-of (I don't think we even know what we don't know). Science is not a religion. It's just a formalized, rigorous mode of inquiry from which most of the data and facts and theories are inevitably replaced over time. It is incapable of handling the Big Questions and Big Truth, but it sure can be useful. For example, we currently believe that "gravity" doesn't exist as a "force," but it's a handy concept anyway. Someday, our talk of "forces" wil be viewed as little more than 18th century gods.
Chesterton: ""If there were no God, there would be no atheists."