"Islam is a threat in the sense that for the true Muslim, Allah must rule the world.
Christ in the Gospel said, "Give to Caesar what is Caesar's and to God what is God's. "
In contrast, Islam, which is based on the law of the Koran, is to govern in all countries where Muslims are. When they are a minority, they may not insist on enforcing the law of the Koran, but when they become the majority, their Muslim duty is to apply the Sharia. Today, there are real Muslim enclaves in Europe, where there is in fact sharia