I tried to find the case, but it hasn't been recorded, as most family court cases are not.
Also, for those of you saying that there must be more to the story that we don't know, that may be true, but it doesn't matter. A court must explain the reasoning for their decision. By ruling as he did, the judge left himself open to being overturned.
If there HAD been a "valid" reason, like the child wanted to be Christian, the judge needed to include that in his reasoning. Becuase he didn't, I think it's more a case of the judge thinking that Wicca is "wrong" and tried to stop it.
As for a Wiccan attending Catholic school, non-Christians still often feel like outsiders in secular public schools that schedule events and vacations around Christian holidays. Heck, I had some teachers who gave me a hard time about missing school for the High Holidays, especially when they fell just after the start of the school year. Yet I didn't really need the time off at Christmas, as even if it did overlap with Hanukkah, it's not the same in terms of pomp.