Non-believers of extreme Islamic faith are targets of ISIS. They kill like those you see in movies of old settings: burning people alive, crucifying, enslaving children, treating women like cattles.
The big issue is, THEY ARE ON THE RISE. Their recruitment worldwide probably employs convincing strategies that even those young people from non suspecting countries have had reports of joining. Children as young as seven year old are being taught to kill.
Can you imagine if they become everywhere in the world and do these things? You'll say THE TIME HAS COME. You'll remember what REVELATION in the Bible has said.
If you are a Christian, you should know about ISIS so you can do your part. ISIS is non like the other terrorists in our history. Google it. Look at the news.
Prayers and fasting should take part in this battle. No time for petty quarrels among different sects of Christian faith. Pope John Paul II has taught: "Jesus Himself has shown us by His own example that prayer and fasting are the first and most effective weapons against the forces of evil (cf. Mt 4:1-11).