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So can this go in Holidays & Traditions?
Yes. The Judaism category, plus Holidays & Traditions.
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How about creating it in the Holidays & Traditions and a weaved link/interlink in the Judaism category page?
I think sharing it on both is better.
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http://www.wikihow.com/Category:Passover
Because it is a holiday, it’s categorized in the Holidays and Traditions. The word “Jewish” is an adjective. If it was solely & specifically pertaining to the religion itself, then I could see it being actually categorized in that. Same rule applies for any other religious holiday - Christmas isn’t double categorized with Christianity.
Well, I think it should be double categorized with Judaism, because it is a major Jewish holiday. Christianity already has Catholicism, Mormonism, & Bibles as its subcategories, so no need to add Christmas or Easter to the mix.
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Adding Judaism is exactly the same if you were to add Christianity to Christmas. Christmas is a (major) Christian holiday. Passover is a (major) Jewish holiday. The religions are just adjectives. There is no reason to double categorize holidays with religions. On the same lines as your defence, let’s add Halloween to witchcraft.