"(On whether Head Six and Head Baltar are angels or demons)
Moore: I think they're both. We never tried to name exactly what the head characters were, we never looked at them as angels or demons. They seemed to periodically say good things or evil things, to save people or to damn people. There was a sense that they worked in the service of something else... that was guiding and helping, sometimes obstructing, sometimes tempting. The idea at the end was that whatever they're in service of is eternal and continues, and whatever they are, they too are still around, with all of us who are the children of Hera. They continue to walk among us and watch."
More
http://www.nj.com/entertainment/tv/index.ssf/2009/03/battlestar_galactica_ronald_d.html
"(On whether Head Six and Head Baltar are angels or demons)
Moore: I think they're both. We never tried to name exactly what the head characters were, we never looked at them as angels or demons. They seemed to periodically say good things or evil things, to save people or to damn people. There was a sense that they worked in the service of something else... that was guiding and helping, sometimes obstructing, sometimes tempting. The idea at the end was that whatever they're in service of is eternal and continues, and whatever they are, they too are still around, with all of us who are the children of Hera. They continue to walk among us and watch."
Good Q&A... worth the read, I think.