When a person buys a new car, he always tries to keep it clean and safe from any type of damages. He will also drive very safely to avoid accidents, as he doesn't want a slight dent on his new car. Even if his own beloved child makes a small scratch on the car, he will become angry and tell the child to stay away from it next time. What makes this person to care for his car so much? It's because he has spent a lot of money and energy behind acquiring the car.
Today, not only one scratch, people are putting thousands of scratches on Islam from all sides. But how many Muslims care? Very few. Why don't they care? It's because they have not spent their health and wealth for the sake of Islam. As a result, they have no value for it. The companions of Prophet Muhammad (peace and blessings be upon him) realized the value of Islam because they acquired Islam by sacrificing much of their energy and wealth.