I don't like the About explanation, but Merii Kurisumasu (actually more like merii krismas) is how you would say it.
The problem with About is that they make it seem like Japanese people don't have a way of saying it, so all Japanese people go about with their English knowledge and say it in English, which is false. Regardless of knowledge of the English language, Japanese people say merii kurisumasu, so it should be considered a Japanese phrase.
Humbug
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