I would do a continuation of Moore's BSG, set on (our) Earth in Biblical times with Jesus as an organic Cylon and the Angels being Raiders and/or metal Cylons. Possibly include cryptozoology/close encounter "greys" as the metal Cylons', that left in the basestar, attempt at becoming organic. If it has legs and I run out of material, start working backwards in the Old Testament and show "God" preparing the early humans (who we know from the previous series are apparently some genetic mixing of indigenous humans, Galactica humans, and organic Cylons) for the arrival of Christ. Heck, Biblical TV seems to be hot right now, why not jump on the bandwagon. I wonder if the Pope would excommunicate me.