Many people today call themselves Christians. For example, an atheistic evolutionist named Anders Breivik hailed himself online as a Christian before he murdered 77 people in Norway. He viewed Europe as culturally Christian as opposed to culturally Islamic, but his view of Christianity had nothing to do with Christ or God.
Leading atheist Richard Dawkins also identifies himself as a cultural Christian, and even more particularly as a cultural Anglican! President Obama repeatedly calls himself a Christian, but then he also supports homosexuality, the murder of the unborn, and other sinful behaviors forbidden by Christ in His Word.
Many people call themselves Christians, but their words and actions are grossly unchristian. Such contradictions stain the name Christian as people look and say, “That’s a Christian? Well then, I don’t want to be a Christian.” Obviously such behaviors reveal that these people—who claim to be Christians and yet promote open sin—deny the Bible as the authority in their lives (Titus 1:16).