There is a few problems when putting together surveys.
"None of this means, of course, that the people in this survey were religious. The fact that they left their homes to join an organization that promised them martyrdom and eternal heavenly reward, relentlessly advertised itself as an agent of the Apocalypse, and claimed to be the righteous vengeance of God Himself strongly suggests their religious interests were not casual. That their humanitarian instincts extended only to Muslims—Sunni Muslims—might also count as evidence that they saw the world through religious eyes, making the only relevant division among their fellow humans the one between believer and infidel. (The report calls this “a sense of identity with coreligionists,” and distinguishes it from religion per se. Again, this distinction isn’t clear, unless you think of Islam narrowly as an academic, scholarly, and legalistic activity.)"