Sadly, many people that say they are a Christian are not really, they just think they are. They wrongly assume that you are a Christian because your parents or grandparents were, etc. or because you go to church or read the Bible or because you were "christianed" in a church or because you were baptized or something like that. But, that is not what makes you, yourself, a Christian. Those are just aspects of a Christian life, but have nothing to do with your salvation and putting put right with God. What makes you a Christian is that you have received salvation from God (through Jesus) and have therefore been put right with Him, and are following Him. It is about faith for salvation, then good works comes as a result of living out that faith in your life as you follow Jesus. The word "Christian" means to be a believer and follower of Christ. The ancient Romans made up the term "Christian" long ago because they knew that the followers of Jesus called Him the Christ (the Messiah or Anointed One), but the early followers referred to themselves as "followers of the Way." Because Jesus said that He is "The Way, the Truth and the Life." Ever since then believers of Jesus have been called "Christians." This is mentioned in the Book of Acts in the Bible.