Starting around the year 1050, certain Sunni scholars of law and theology, called the “ulema,” began working closely with political rulers to challenge what they considered to be the sacrilegious influence of Muslim philosophers on society.

Muslim philosophers had for three centuries been making major contributions to mathematics, physics and medicine. They developed the Arabic number system used across the West today and invented a forerunner of the modern camera.

The conservative ulema felt that these philosophers were inappropriately influenced by Greek philosophy and Shiite Islam against Sunni beliefs. The most prominent name in consolidating Sunni orthodoxy was the respected Islamic scholar Ghazali, who died in the year 1111.

In several influential books still widely read today, Ghazali declared two long-dead leading Muslim philosophers, Farabi and Ibn Sina, as apostates for their unorthodox views on God’s power and the nature of resurrection. Their followers, Ghazali wrote, could be punished with death.

As modern-day historians Omid Safi and Frank Griffel assert, Ghazali’s declaration provided justification to Muslim sultans from the 12th century onward who wished to persecute – even execute – thinkers seen as threats to conservative religious rule.

This “ulema-state alliance,” as I call it, began in the mid-11th century in Central Asia, Iran and Iraq and a century later spread to Syria, Egypt and North Africa. In these regimes, questioning religious orthodoxy and political authority wasn’t merely dissent – it was apostasy.

Parts of Western Europe were ruled by a similar alliance between the Catholic Church and monarchs. These governments assaulted free thinking, too. During the Spanish Inquisition, between the 16th and 18th centuries, thousands of people were tortured and killed for apostasy.

Blasphemy laws were also in place, if infrequently used, in various European countries until recently. Denmark, Ireland and Malta all recently repealed their blasphemy laws. But they persist in many parts of the Muslim world.

In Pakistan, the military dictator Zia-ul-Haq, who ruled the country from 1978 to 1988, is responsible for its harsh blasphemy laws. An ally of the ulema, Zia updated blasphemy laws – written by British colonizers to avoid interreligious conflict – to defend specifically Sunni Islam and increased the maximum punishment to death.

From the 1920s until Zia, these laws had been applied only about a dozen times. Since then, they have become a powerful tool for crushing dissent.

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