Muslims account for one-fifth of the world's population, but most Americans know little about their faith, Islam, which continues to be one of the fastest growing religions in the United States and around the world.

What does it mean to be a Muslim today? Does Islam deserve its reputation as a patriarchal, authoritarian, and anti-Western religion? What is the role of Islam in movements for political and social change?

FRONTLINE explores these and other questions in "Muslims," a special two-hour film examining the different faces of Islam's worldwide resurgence and the fundamental tenets of the faith. Reporting from Iran, Nigeria, Egypt, Malaysia, Turkey, and the United States, and drawing on the perspectives of leading scholars of Islam, this program tells the stories of Muslims struggling to define how Islam will shape their lives and societies.