Good Q: Answer - Remember in Acts 26:28 when King Agrippa said to Paul... "Agrippa replied to Paul, "In a short time you will persuade me to become a Christian."
Their is reason to support that the term "Christian" was what Romans referred to those who were a part of the earlier name of the movement, also found in Acts 9, "The Way." Christians, as we call them now, did not have a title that they identified with, in fact, you clearly see that neither Peter, Paul, Jude, Timothy - nor the debated author of Hebrews ever used the word Christian in their epistles - neither did John for that matter.
My take on what Agrippa said, or, what he meant when he used the word "Christian," is that it was a derogatory word meaning - "little messiahs." Conversion, as you probably have learned from experience, is often a time consuming, prayer rich process. But Agrippa's statement indicates that Paul was VERY GOOD at persuasive argument.
I do agree with what Sid Kemp said to some measure. Christ came to reveal Himself in the Old Testament...He did deliver a new Covenant in that He gave the OT proper exegesis to those who were lost - first the Jews, then the Gentiles - evidenced by the woman who retorted to Christ that - "even the dogs eat the crumbs that fall from the Master's table." "Dog" (historically) was a term Jews used to describe Gentiles - non Jews, Samaritans, Gentiles - all these were "unclean" - but Nehemiah 8 has a clear reference to Jews in OT times being called to spread the word amongst other nations.
Christian, then, is a "slant" that we take - in truth, it's persecution. Now, it's a title given to those who believe. Count it all joy when you are persecuted for MY NAME'S SAKE... In other words, little messiahs means small, little, insignificant when used by an ancient Roman.
Paul hated titles, and argued with those who said they were "of Paul, or of Apollos." Paul added to the chain of thought that he says that he is "OF CHRIST." Not a Christian, but of Christ.
Finally, if anyone could persuade others to become a Christian, it would have to be Paul. Can you imagine trying to convince someone to become something that is in contrast with their perspectives? Well we can't, if what we believe is correct, the Holy Spirit will do majority of the work, and that through us. We do nothing, not even become Christians because big or small, I CANNOT SAVE ANYONE. I am no messiah, Christ is! I am not a Christian, but I am of Christ.