"A lot of people die for God... and they're not afraid." Yeah, those people who died in the crusades were really fighting for God... They weren't the second sons of the nobility desperate for land and riches or anything. They totally didn't rape every woman and pillage holy monuments that would have been holy to Christ.
The difference between a martyr and a self-righteous bastard is that true martyrs didn't go out looking for what got them killed. It happened to them because they were just going about their business. Please, and let's not forget how killing was done during the Spanish Inquisition and even during the Renaissance "in the name of God" to get rid of Jewish people in Europe. That was totally for God and had absolutely nothing to do with Christian people being angry that they couldn't charge interest on money lending.