Daesh (isis, isil) have (so far) committed three genocides:
1, Against Yazedis. They killed 7000 men and kidnapped 5000 women and children (girls).
2, Christians. A thousand people kidnapped and killed.
3, Muslims. Tens of thousands killed and kidnapped.
So, are Daesh Muslim? They think they are and sometimes they deny killing Muslims. However there are too much proof at You Tube and I’m not going to share those movies with you. They are justifying their rampage hiding behind a religion. Causing people not only to suffer in fear in their home countries, but being rejected from a nation they considers safe.
So how do you find a terrorist among religious people? You don’t. Not with a religious test anyway. Not by asking about jihad, since that is misinterpreted to the most Muslims. I’m sure there are ways to get a good idea but when we’re at it – forget about torture.
See the individual. Her rights and her needs.