Is my role playing storyline description good?

The story follows Stahn as he tries to prevent the Holy Crusade, an event that will destroy all of mankind and eventually take the life of his newly-found friend Shirley. The Holy Crusade entails the mive destruction through war of the human race by the Valkyrie deities in attempt to "purify" the world of the evilness that is humans. This story describes the adventure of Stahn as he tries to build up a rebellion strong enough to fight the threat of the Valkyries