Dante Shepherd explains:

No one should be wasting their time putting salt shakers everywhere. Remember that the next time a Christian says, “But you can’t prove God doesn’t exist.”
Even with god, though, it’s not like Christians keep “salt shakers” everywhere either. How many church sermons urge Christians to be more like Christ? How many fall short of the bar they seem to set?
Maybe it’s because, as Mark Twain once said, “Faith is believing what you know ain’t so.” If people actually, sincerely believed in God — if they feared him and wanted to be near him in the afterlife — they would act like little angels all the time. They don’t. And that should tell us something.
“Sins” aren’t momentary lapses. They’re like Freudian slips, showing the world how you really feel, giving away the fact that deep down you don’t really buy into all the theological garbage they teach in church.
When Christians “sin,” they’re just showing us there are no salt shakers in their house.
How’s that for overanalyzing a comic?
(via Surviving the World — Thanks to Lauren for the link!)