The Kingdom of God is unshakable. Any false notions of “taking down Rome” doesn’t mean the Church of Jesus Christ is defeated.
What looks like “defeat” in this world isn’t the true report of the Kingdom of God.
28 Therefore, since we are receiving a kingdom that cannot be shaken, let us be thankful, and so worship God acceptably with reverence and awe, 29 for our “God is a consuming fire.” (Heb. 12:28,29)
21 martyrs were not defeated. The Church is not defeated. The Kingdom of God is not defeated. Our King will bring it all into account. That may mean something tough for us in this time period, but that is not the ultimate story.
Let the King settle the accounts.
ISIS comes out on the losing side of that equation.