A hadith depicts Muhammad saying: “Whoever changed his Islamic religion, then kill him” (Bukhari 9.84.57). The death penalty for apostasy is part of Islamic law according to all the schools of Islamic jurisprudence.

This is still the position of all the schools of Islamic jurisprudence, both Sunni and Shi’ite. Sheikh Yusuf al-Qaradawi, the most renowned and prominent Muslim cleric in the world, has stated: “The Muslim jurists are unanimous that apostates must be punished, yet they differ as to determining the kind of punishment to be inflicted upon them. The majority of them, including the four main schools of jurisprudence (Hanafi, Maliki, Shafi`i, and Hanbali) as well as the other four schools of jurisprudence (the four Shiite schools of Az-Zaidiyyah, Al-Ithna-`ashriyyah, Al-Ja`fariyyah, and Az-Zaheriyyah) agree that apostates must be executed.”

Qaradawi also once famously said: “If they had gotten rid of the apostasy punishment, Islam wouldn’t exist today.”

“ISIS beheads Syrian teenager on charges of ‘apostasy,’” by Jan Nasro, ARA News, January 31, 2016 (thanks to The Religion of Peace):

URFA – Extremists of the Islamic State (ISIS) beheaded on Saturday a Syrian teenager in the northern city of Jarablus after accusing him of apostasy. The 14-year-old boy was arrested by ISIS militants for missing Friday prayers at the central mosque of Jarablus, where pro-ISIS preachers usually deliver speeches promoting the group’s alleged Caliphate. Speaking to ARA News in Jarablus, civil rights activist Nasser Taljbini reported that the ISIS-led Sharia Court order the militants to behead the boy in public. “Dozens of people attended the brutal execution, including the victim’s parents who were forced to witness the beheading of their own son,” Taljbini said. “ISIS is trying to prove that it is still powerful despite all the military defeats. The group is trying to terrorize people through conducting such public punishments,” the source told ARA News. Local sources in Jarablus said that ISIS sees in the teenagers as future jihadis who should receive a proper Sharia education in order to stay committed to the message of the so-called Caliphate.

What? But CAIR told me Sharia was entirely benign!