ISIS members and other terrorists are not devout Muslims at all, as they are extremists and they may even be disbelievers but Allah Knows Best. Just like Hitler, when he used extremist Christian teachings to kill millions. Crack open the books and gain some knowledge, especially the book of Allah the Quran. I'll make it easy for you 'Insha'Allah (if Allah Wills) just check out
www.TheNobleQuran.com You don't have to die as a Slave of the Devil, you have freedom of will.