“Islamic terrorism” oxymoron runs up 819,000 usages on Da Google

There's more involved here than words. “Islamist terrorism” is what you want to say when you talk about ISIS and al-Qaeda. They are properly “Islamist” because “Islamism” and “Salafism” are the names in English for the offshoots from worldwide Islam that spawned their movements. You can tell right off that the Islamists have departed Islam….