A global caliphate is the objective of Islam. Peaceful or not, this is what Muslims are working towards. Whether they are having 7 children, making bombs, making money, infiltrating Universities and governments, they are working with that objective in mind. Not all carry guns. Not all are "extremists".
The majority of people believe that Islam is a religion, but it’s actually a community-state - a way of life with a religious component to it. Islam is a geopolitical system that has government, financial, military, legal and religious components to it. It's a totalitarian system that encompasses every aspect of one's life.
Islam is not a religion. It's a competing political system. If you fail to understand that, you fail to understand Islam, and you fail to see your country taken over.