I'm a (theologically eccentric) Pagan. And going by previous threads on this topic, I think there are probably enough pagans on here to merit our own poll option.
As for the Witness/Christian debate, while they are certainly quite theologically different from mainstream christianity, I don't think that's the same as not being a branch of christianity. Perhaps making the christianity choices "Catholic" "Protestant" and "Other - Christianity based" where the latter could include things like Jehovah's Witnesses, Mormons, Christian Scientists, and the other sects that are based on the christian scriptures but have additional scriptures/a radically different interpretation?
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By day, a mild mannered Religious Studies major
But by night, a mild mannered Religious Studies major who's asleep