- Christianity
- Judaism
- Islam
Plus:
Many times, any sect that includes a 'Jesus element' is included under Christianity (i.e. Mormonism, Jehovah's Witnesses, and Gnosticism). Although Jesus is an element of Islam (as a prophet, not the Savior), it is counted separated.
An excellent quick-reference chart can be found here.
Breakdown of major religions by percent of population:
Next Week: Chapter 5 Case for Christ