As I understand it, the Protestants are heretics and schismatics, sometimes only material heretics, but due to their schism out of the Church and unable to be saved. Their worship services are mortal sins and sacrileges.
A Hindu is a pagan, who worships false gods, although in our time we tend to think of the average unbeliever as a "pagan" as well, when they are atheists or agnostics and don't believe in ANY gods, let alone God.
It always sounds wrong when I try to describe myself before baptism as a "pagan," as if I worshiped Hulu-Mulu the Rain God and tore hearts out of chests. But I guess it fits in a way because Christ, when describing the Second Coming, says "All the tribes of the Earth will mourn." It's not as if everyone on Earth is going to be a Native American. He means that almost everyone is going to have a pagan attitude. Hence you have all these Gentiles that look like Maoris with tattoos and earrings.