“Cultural appropriation” might be a valid accusation for something like a middle-aged white woman paying $3,000 to be trained as a Native American “shaman” during a three-day course, but in most cases it’s absolute BS.
It is BS then too.
Appropriation is defined as "the action of taking something for one's own use, typically without the owner's permission."
Cultures have no owners, only followers. And you can not "take" it because it is not physical.
You can suppress a culture, you can not appropriate a culture. It is just not possible.
There is no such thing a "religious appropriation" either. And yes, that is the next thing coming down the line.