I am attaching a pdf for you to download that has all the occurrences of the word “disciple” in the NIV paralleled with the Greek New Testament. There are nearly 300 occurences of this word in the New Testament!
In contrast the word “Christian” appears less than half a dozen times. In our current way of thinking one can be a Christian without thinking of themselves as a disciple but one cannot be a disciple without also being a Christian – be a disciple. A disciple is a follower of Jesus. This is how the first Christians thought of themselves and we should as well.