The religion of Islam was founded by Muhammad, the 7th century prophet whom Muslims call "the messenger of God."
They don't consider him divine, but they follow his teachings closely. Good Muslims are taught to emulate the prophet in all matters, personal, spiritual and worldly.
Perhaps no time in recent history has it been more important to do as the Prophet Muhammad did — and not as someone says he did.
With terror groups like ISIS now invoking his name, many Muslim leaders say radicals who cite the prophet to justify violence misrepresent his teachings.