What does it mean to be called a Christian? We accept that the term itself essentially means, "of Christ," or if you prefer, "one who follows Christ." But in a larger sense, what perception or expectation do people have when they refer to someone as "Christian."
For some, it might be descriptive of a person with a charitable nature in their actions. For others it could be an expectation of a behavior, good or bad: "That's the Christian thing to do..." or, "That's not very Christian of you." Still others see it as a profession of one's "religious" affiliation or group. Literally, the term can mean so many things depending on the one using the term and that particular person's intended meaning.
For the one who claims the name of Christian, there is a responsibility associated with the name. It's not a responsibility to act in a certain manner--although our actions and behavior should be like Christ. It's not a responsibility to speak or think in a certain manner--although our words and thoughts should be echo and reflect Christ. Instead, our responsibility is to be committed to God's truth above all else: All we do must be consistent with what we believe and who we are in Christ.