What is the main conflict in Snow Crash by Neal Stephenson?

Hiro Protagonist, freelance hacker and the greatest sword fighter in the Metaverse, teams up with Y.T., a fifteen-year-old female courier, to delve into a mystery that mixes Sumerian myth with virtual reality in a gritty cyberpunk setting. Hiro and Y.T., along with Hiro's old girlfriend Juanita, race to stop a plot masterminded by a religious business monopolist that would brainwash the masses and knock freelance hackers out of commission.