I have to politely disagree with this statement. To place faith in something means that you believe it to be true regardless of evidence. If you aren't certain, it is not faith but guesswork.
Well, I've had theist friends who'd disagree with that, who've said, paraphrased, that "if your faith has no doubt, then it's not faith, it's a dogma." I can't speak to this myself, but I do find their choice to believe despite their doubt more honourable than someone's blind certainty.
"If God did not exist, it would be necessary to invent him." -- Voltaire
This game also introduced me to Last and First Men by Olaf Stapledon, from an optional dialogue with a bartender in a hidden area in the hong kong game map.
Deus Ex was way ahead of its time, like a lot of cyberpunk media is.
Morpheus: "The need to be observed and understood was once satisfied by God. Now we can implement the same functionality with data-mining algorithms."
JC Denton: "Electronic surveillance hardly inspires reverence. Perhaps fear and obedience, but not reverence."
Morpheus: "God and the gods were apparitions of observation, judgment and punishment. Other sentiments towards them were secondary."
JC Denton: "No one will ever worship a software entity peering at them through a camera."
Morpheus: "The human organism always worships. First, it was the gods, then it was fame (the observation and judgment of others), next it will be self-aware systems you have built to realize truly omnipresent observation and judgment."