What people need before befriending Muslims is not advanced knowledge of Islam but a willingness to discover what is important to their Muslim friends and the desire to invest the time to learn and discuss those matters as the relationship progresses. When it comes to a basic knowledge of Christianity, though, it is important for people to be able to articulately explain what they believe and why. That, at least, is what 1 Peter 3:15 tells Christians to do.
