What is Celtic in Wicca, and how did things that are not get stuck with that label?
There are very few things in Wicca that are inherently Celtic. In general, the entirety of Celtic culture borrowed in Wicca is the language used for the non-astronomical holidays (Samhain, for example.) Even the practices that occur on the holidays given these names are rarely Celtic in nature, and whether or not they should be called by these Celtic names is a valid question, especially considering that Early Modern Wicca labeled them August Eve, November Eve and the like. To read the erroneous literature out there, the four elements are Celtic (Celtic holy numbers tend to come in threes, and more rarely, fives,) the concept of duotheism, having a great goddess and a great god is Celtic (they, like most indigenous peoples, were polytheistic, and in their current culture are many religions, most predominantly Christianity) and the eight liturgical holidays, enumerated by Murray, are Celtic, even though they used a radically different calendar than our own to figure their holy days. Sur