Well, if the whole point is that everyone needs to apply critical thinking to his or her beliefs, I would agree with that. But usually, the argument in the graphic is thrown at Christians to imply that, because their beliefs may have been geographically derived, therefore they are almost certainly wrong. It proves no such thing, and there is no relationship between geography and truth claims; that was really my only point in commenting here. So yes, SweetBaby, I would agree with what you say, for the most part. Intellectual vigilance is necessary in maintaining (and, if necessary, modifying) any belief structure.
Leaving, thanks for the Plantinga link, I've saved it for near future reading.