I can touch on this a little bit.
I lived in the Deep South for a long time, still do off and on between there and the UK because my home country is a shithole. Voodoo is widely practiced by white people, especially Louisianan Voodoo, which has always had white practitioners. Most black people don’t care, in fact high ranking figures in the religion back in Africa have said that they feel it’s a religion that anyone can practice. There are very prominent white spirits in the religion, like Maman Brigitte.
The closed religion argument could be made, perhaps, for Haitian Vodou or the West African strains, hell, even hoodoo from Georgia and the Carolinas..but for Louisianan Voodoo it just doesn’t stick. The blacks that get really testy about it didn’t grow up with the practice, usually. Odds are they came into it trying to reconnect with their ‘roots’ (whether their ancestors even practiced it or not), and entered the religion with a very negative view of whites to begin with. Think your upper middle, college educated BLM types. They’re like a cancer for folk religions because they feel like they need to ‘correct’ the thinking of long time practitioners, and are the most vocal when it comes to the faith’s public exposure.
It’s all virtue signaling and posturing, however. During my travels I knew a white guy who was a ‘priest’ and nobody in the community gave a rat’s ass.