What is a Christian?
A dictionary definition of a Christian would be something similar to “a person professing belief in Jesus as the Christ or in the religion based on the teachings of Jesus.” While this is a good starting point, like many dictionary definitions, it falls somewhat short of really communicating the biblical truth of what it means to be a Christian. The word “Christian” is used three times in the New Testament (Acts 11:26; 26:28; 1 Peter 4:16). Followers of Jesus Christ were first called “Christians” in Antioch (Acts 11:26) because their behavior, activity, and speech were like Christ. The word “Christian” literally means, “belonging to the party of Christ” or a “follower of Christ.”        Read more at : 
https://www.gotquestions.org/