The practices are widespread and frequently overlooked by church authorities in the Carribean and Latin America, with a wink and a nod, even in the United States, particularly along the Gulf coast, but in every major city as well. The practitioners of Voodoo and Santeria are Catholic. They pray and make sacrificial offerings to Catholic saints, that they have conflated or “syncretized” with old, African or native, pagan gods. This is factual.
You seem to want to critique the weaknesses of decentralization of authority, in Protestant and independent Christian churches. These weaknesses are certainly present and well-publicized, but also dealt with swiftly almost without exception. Such critics as yourself repeatedly fail to recognize, that error can creep into even your top-down hierarchy. There’s a Biblical passage dealing with this, pertaining to motes and beams.
Cast it out of your church, rather than refusing to deal with it by concealment and denial. No good can come of permitting or even overlooking such a thing, as the recent difficulties in your church with homosexual priests and sexual abuse attest. I’ve long thought your seminaries were deliberately targeted and inflitrated by radicals, myself. Centralization makes this sort of tactic possible.
Again, cast it out. Disallow it, in deed as well as in word. You’ll survive the publicity and come out the better for it. Protestants and independents always have.
Bluster and denial are easier for Catholics to deal with.