David shares the origins, beliefs, differences, and conflicts with Christianity, centered on the "radical Shiites."

Islam is a major monotheistic religion originating in 7th-century Mecca (modern-day Saudi Arabia) through revelations received by the Prophet Muhammad. It holds that Allah is the one true God and Muhammad is His final messenger.

Centered on the Quran as its holy book, Islam has over 1.5 billion followers, known as Muslims. They practice five core pillars: faith, prayer, charity, fasting, and pilgrimage.