There are three foundations to Islam: the Koran, the Hadith (reputed sayings of Muhammad), and the Shariah law code. All three are equally authoritative. In those places in the world where Islam is dominant, the essence, character, and attributes of the religion are on public display. Here is one vignette:
Pregnant 'Muslim' woman sentenced to death
7:26 AM Friday May 16, 2014NZ Herald
A Muslim-by-birth Sudanese woman who married a Christian man was sentenced to death after she refused to recant her Christian faith, her lawyer said. Meriam Ibrahim, whose father was Muslim but her mother was an Orthodox Christian from Ethiopia, was convicted of "apostasy" on Sunday and given four days to repent and escape death, lawyer Al-Shareef Ali al-Shareef Mohammed said.