Early in One.Life Scot McKnight shares some of his own journey.
Early in his life he learned that a Christian was someone who had experienced an event, specifically accepting Jesus as their savior and saying a certian sort of prayer.
Later he expanded this definintion, learning how important personal piety was. A Christian then was someone who was saved and who's life was marked by acts like prayer and reading the Bible.
Though affirming both those things as good, McKnight came to a point where now he suggests that this is not how Christ himself framed what it means to be a Christian. Instead a Christian is more accuratly and simply decribed as someone who follows Jesus.
The rest of One.Life uses this story from Scot's life to spells out why that difference matters and what following Jesus looks like.
My question for you is this: If that question "What is a Christian?" was posed to you, how would you answer?