[...]
"Christian Shavuot sometimes coincides with Shavuot, but it doesn't commemorate the giving of the Torah at Mt. Sinai.
"Christians don't have any custom of celebrating the giving of the Torah, though this story is also in the Christian Tanach, what they call the 'Testament.'
[...]
"Christians believe that the strong wind and flames from the story represent the Ruach Ha'Kadosh, which inspired the followers of Yeshu to promote their beliefs to others.
"Christians today understand this story as the symbolic beginning of their religion, the 'birthday of the church.' In this case the word 'church' does not mean 'Christian shul' as it usually does, but something more like 'kehilla' or 'Christian klal.'"
[...]
-- Jew Who Has It All (JewWhoHasItAll), 2022-06-03 (link goes to start of thread)
[Jew Who Has It All is a satire account, shining a light on the Christian-normativity of the US (even our atheists and apathists tend to see culture through a sort of Christian lens regarding what is ordinary and what is exotic), by portraying life in a version of the US where Jewish tradition is the default framing and most common belief, and Christians are a minority. Often this takes the form of "misunderstanding" -- or just describing very clumsily -- Christian holidays, beliefs, and practices, in ways that resemble how Christians without enough Jewish friends often get Judaism wrong in our own reality. (The long explanation of Christmas is a delightful example of this.) And sometimes it's simply a matter of describing things pretty well but through a "translating for a Jewish mainstream" filter. (The explanation of Pentecost, for example.) Plus there's a lot that quite simply celebrates Jewish things as "Everybody does this, right?" She's careful to not mock Christian beliefs themselves, only (a) ways non-Jews often get things confused or explain them very clumsily, and (b) how Christianity is normalized in American culture, with Christian holidays catered to by default but everyone else's holidays often being treated as special accomodations. The entire feed is a treasure. Another account, Jewsplainer (JWhoKnowsItAll), provides context and translations for folks who need them.]
[Anyhow, joy and blessings to everyone celebrating either Pentecost (since they coincide this year), be it Shavuot or Whitsunday!]