English History: The Cathars and Horatio Nelson

This is a compilation of 2 different titles, which are about the following topics:

1: The Cathars were different from the mainstream Catholic church in the 13th century. They openly rebelled against some of the hypocritical behavior by priests and leaders, and they established their own deviant beliefs according to the best ability of their conscience.

But when it all came down to it, what did this mean? What were those belief systems? How did they look at God, Satan, the purpose of life, or ...