The advertising was so bad! I have the show on DVD and in the commentary, the creators say NBC was really supportive of the biblical angle while they were making it but we're scared to advertise it that way so I remember the ads were like "from a producer of Heroes" (which was in season 3 and crashing and burning like nothing else) and a bunch of random imagery of butterflies and flags.

Interestingly, it was one of the more expensive shows made at the time, with a FOUR MILLION per episode budget! (laughably low now, of course.)

By the way, the same writer/director team are working on a Bioshock show