This question led to discussion that eventually brought us to a revelation. People are often sold on what they should believe. Churches and Christians fight hard to convince people of what things they should believe. The problem is that many people believe things that they don't care about. You can have a belief in something that you don't care about; however, it is impossible to care about something that you don't believe in.
Instead of trying to convince people to believe the right things, we need to work at helping people care about the right things. Christians believe its important to share their faith, but most don't. Why is the case? Because they ultimately don't care about it. Many people believe its wrong for people to suffer injustices, but most people don't care enough to take action. People might believe that living their life obeying God is the best things to do, but most don't care enough to actually live it out. In other words, we have to find ways as churches and Christians to help people care about the right things. That will be the only time that they will act on their beliefs.
I would love your feedback: What are things in your own life that you would say you believe in them, but you don't care about them? What are ways the church/Christians can help people care about the right things?