In his book, The Likeability Factor, Tim Sanders poses four characteristics – friendliness, relevance, empathy, and realness – that influence whether people like us. Since most people prefer to spend time (and do business) with people they like, these characteristics are important predictors of our success in life and business.
These same factors also influence our effectiveness in sharing our faith. If what we believe does not influence how we interact with others, then it is not relevant faith.