If you're asking me, no I don't think the poll sucks. Any poll asking for religious affiliation is going to have problems with it, because it is attempting to map a bewilderingly large and diverse landscape. The best you can do is think about how you want to use the data and what they are for, then tailor things in a way that makes sense for the intended purpose. For this site, it makes most sense to make the options reflect the DIR forums, perhaps? That scheme has flaws also, but it bears relevance for the site. I wouldn't lump "New Age" under Neopagan, for example.
By and large, I prefer religious identification polls that allow you to check all that apply. That's one of the things I didn't like about the original one.