What - you didn't think there was a difference?
"You can become a Christian in a moment. But to become Christian is another matter. In our evangelical churches we are very adept at teaching people how to become a Christian - how to receive the forgiveness available in Christ. We have not been nearly so adept at teaching people how to become Christian - how to become Christlike in a way that helps flood a world hell-bent on vengeance with the grace of forgiveness. But as your read the New Testament, you will find that Christ and his apostles place far more emphasis on becoming Christian than on becoming a Christian.
I fear we have contented ourselves with the self-congratulation of becoming a Christian, when the call of discipleship is to become Christian, to become Christ-like, to become imitators of Christ in a fallen world where true imitation of Christ is radically counter-cultural and deeply counterintuitive."
From Brian Zahand, Unconditional?: The Call of Jesus to Radical Forgiveness, page56-57