It's not like the layout of the promo picture is irrelevant. They all but say the Cylon's interpretation of religion is the correct one in the last 10 minutes of the show, when we see the incorporeal representation of a Cylon that we've been seeing since episode one wandering around downtown New York discussing the implications of our existence.The positioning of Gaius looking to the projection of Caprica Six, and the fact that Caprica Six, in turn sees a projection of Gaius leads me to believe that they are the Jesus analogues of the series, with Caprica Six representing faith and confidence, and Gaius represending humanity and doubt.