Why doesn't God just kill all the ISIS people ?

Because they do serve one necessary purpose: This is how the world could be if God didn't have control.

So God LETS them live as an example of what will happen to the rest of us if we turn away from God.

Don't worry about those Christians they have killed. They are martyrs. As the "tools" by which God shows His example, they have a special place as saints in Heaven. They have the advantage -- even now, they are living a life better than anything we on earth can imagine, and have been spared the pain of the even more deadly, torturous, and evil deeds that will come in the future. Great Blessings to their families who still have to live in such an evil world.

Your statement if very unchristian.

The people of the Islamic State of Iraq and Syria are no different than the people of other nations. They are misled by their leaders. Happily, though, the good news of God´s kingdom government is being preached in those countries as well as the rest of the world. Even though there are restriction on Christian activity this has not stopped many from accepting the truth found in the Bible.

In the Revelation given to the apostle John about 96 C.E., John saw an “angel flying in midheaven” who had “everlasting good news to declare as glad tidings to those who dwell on the earth, and to every nation and tribe and tongue and people, saying in a loud voice: ‘Fear God and give him glory, because the hour of the judgment by him has arrived.’” (Re 14:6, 7) These inspired statements indicate that in the “last days” there would be an unparalleled proclamation of the good news of the Kingdom.

Yeah, I think the "hail Jesus" revealed you as a troll. If not, that's a very "Christian" mind set you have. You folks are so loving, and non-judgmental, and charitable, and forgiving <sar>. How about you put all the Muslims and Christians in a room and let THEM fight it out? Then the rest of humanity would finally have some peace.

How can he kill people if he doesn't exist...

god is giving them time to repent and change

he will eventually bring judgement to them

Because Obama wants to give them jobs.