I heard (many years ago now) of a survey of Chinese Christians. They were asked how they became Christians—I expected to hear about apologetics or personal testimonies chock-full of Scripture. Nope. Doctrine came after conversion. What caused them to become Christians was watching their co-workers lives. They wanted what they saw.
For we are to God the pleasing aroma of Christ among those who are being saved and those who are perishing. To the one we are an aroma that brings death; to the other, an aroma that brings life. 2 Cor 2:15-16a (TNIV)