You don't have to imagine, the Vulcan salute was lifted (granted by a Jewish actor) straight out of an orthodox ceremony into a very secular film franchise.

50 odd years later, most Jewish folk are fine with this.

Not everyone treats being offended as a competitive sport.

https://en.wikipedia.org/wiki/Vulcan_salute

He appropriated his own culture? Shall we then count everything inspired by other European cultures, that is present in pop culture, as "appropriated", regardless of who introduced it to pop culture?

I agree the idea of cultural appropriation is absurd, but so was his (and yours) example.

So why should anyone care about anyone else's cultural and religious symbols and traditions if those that are Christian are fair game?

I also don't like the relativism involved in appealing to the feelings of other people. People have all sorts of feelings.

Yes, that was my point. Non-religious songs about a religious holiday.