Shariah “law” is a misnomer and a very nuanced subject misconstrued by Islamophobes to instill fear about the religion of Islam and its followers, Muslims. Shariah are the principles and practices that Muslims follow based on the Qu’ran (Islam’s holy book) the practices and teachings, of Prophet Muhammad (peace be upon him). There are four schools of thought in Islam, and each school have different interpretations of these verses, practices and teachings based on the time period, culture and knowledge. Muslims regard Islam to be a way of life, not just a religion. To be the best Muslim, individuals emulate the Prophet Muhammad (peace be upon him). For example, when the Prophet (peace be upon him) drank water, he sat down and use his right hand to hold the cup and supported the bottom with his left hand. So many Muslims drink water in the same manner and this would be a practice under Shariah.
“Shariah law” is a term used by those who instill fear and misinformation about Islam and Muslims. Islamopohbic propaganda refers to “Shariah law” and a set of laws used to kill and punish. Islamophobes often referred to dictatorial countries who claim to use Shariah to stone people to death or kill people who leave the religion of Islam “apostates”. There were punishments used during the time Islam first started that stoned people or beheaded people, similar to midevil punishments used in Europe during the same timeframe. Islamophobes and the propaganda twist a Pew Research Poll saying the many Muslims in Muslim countries support the idea of Shariah being the law of the land. Islamophobes then make the leap in saying that the majority of Muslims want Shariah law and that means killing all people who leave the religion of Islam! See Pew research “Muslim beliefs about Shariah” http://www.pewforum.org/2013/04/30/the-worlds-muslims-religion-politics-society-beliefs-about-sharia/
However, if staying true to Shariah principles, modern Islamic interpretation finds these practices have been outdated and found to be inhumane and no longer used in the overwhelming majority of countries who have majority Muslim populations.
In fact, the largest number of Muslims per capita are in Indonesia, which is a democracy. And a researcher who studied how many people have been killed for leaving the religion of Islam from 1980-2006 found only 4 people had been executed. See: https://www.nytimes.com/2006/03/26/weekinreview/in-kabul-a-test-for-shariah.html