Is it possible that someone is immune to Macumba or will not feel its effects?
No, everybody can be affected by Macumba. Unlike a religion or “voodoo magic”, you do not have to believe in Macumba to feel its effects. In fact, Macumba works even stronger for people who don’t believe that such a thing exists. The only occasion where a person might not be affected by Macumba is if that person has a very strong protection from negative Macumba through items like protection jewelry or protection sand, and the Macumba effect you are trying to use against this person is a negative effect. The chances that you would meet or know such a person are extremely small, as complete protection from negative Macumba effects is something only very few people enjoy.