Your mission, if you accept it (an idea spinned from a suddent idea in The Future Spread of Religions thread in the Future section), is to make Candomblé - the local 'voodoo'/afro-'american' religion -THE religion of ATL Brazil, instead of Catholicism (but having a coexistance is very fine), or at very least, a serious stuff, large % of followers openly.
Would by example even more slaves, or mixing of races, AND a rise of a different form of nationalism, like the local far-right ideology - Integralism - do it?
BONUS TOPIC
Bonus point if you do it too OR instead with another nation, and their local 'voodoo' (Vaudou of Haiti, Santeria of Cuba...).
((BTW, a related question; what is the official and real politics of Cuba vs Santeria and it's adepts, while I am at it? A 'superstition, to be smashed', or 'an admirable local specifities of the oppressed people, to be protected'?))