What makes a Christian?

There is totally no reason for being proud of being a Christian. As a matter of fact the term started out as a swear word that was first applied to this particular Jewish sect in Antioch (Acts 11:26).
Paul struggles with the congregation in Corinth because one says, “I follow Paul”; another, “I follow Apollos”; another, “I follow Peter”; and another, “I follow Christ.”
“Christian” is a very limited term that only refers to the second person of the Holy Trinity, omitting the Father and the Holy Spirit, yet rightfully focusing on the center. What do you think makes a Christian?