"What about Voodoo or Santeria?"
Perfectly fine, as long as there are no sacrifices involved. Both are alive and well in South Florida.
I agree with that ---if I have one neighbor who is into Voodoo and another who is into Islam, as long as they leave me alone and aren't committing crimes, it's all the same to me. I wouldn't necessarily have to respect either religion, I don't expect my government to establish one or the other or both, I wouldn't harass either neighbor but because of recent events I would be keeping my eye on the Islamic.