A vital gift
According to Paul's letter to the Romans (chapter 12) leadership is a gift of God. Paul is not thinking here of the ordinary practise of human leadership, but the spiritual gift of leadership - which is very different from human leadership, or what we might call "worldly leadership".
The practise of worldly leadership is very different from spiritual leadership. A worldly leader may have acquired his position by smooth rhetoric - some people can talk and charm their way to the top. Perhaps she got there by wealth - in the ancient Roman world you bought positions of authority (as you do in many countries today). Perhaps it was sheer force of personality or even bullying or education, that led to the top. There are unusual worldly leaders who did not get to the top by these means, to be sure, but they are rare.
Christian leadership and secular leadership may, like two circles, overlap in the middle. For example, all leaders are communicators (they answer emails, texts, etc.) and all leaders give attention to detail, but here are five unique qualities of Christian leadership, taken from Christ our supreme example:
(1) Christian leaders are humble. This is the first requirement, and it is evidenced by teachability and a submissive spirit. Someone who does not know how to "back down", who has never been known to submit to another may make a fine leader in the world ("he's a strong leader" they may even say, "she's never made a U-turn"), but this person does not have the gift of Christian leadership.
(2) Christian leaders are courageous. A Christian leader must put the will of God before the will of anyone else - including the will of his wife, family, whoever. When Jesus' family came to him on one occasion, assuming he would automatically and immediately jump to their needs, ("of course, they are flesh and blood"), Jesus continued teaching - for his Father had given him that task.
(3) Christian leaders have a servant spirit. "The Son of man came not to be served but to serve and to give his life as a ransom for many." Leaders don't hang around waiting to be crowned, but without any promptings get on with the work as humble as it may be. This inded is a major way their gift is discerned: they are servant hearted.
(4) Christian leaders lead by example. Christian leaders do not say "Do this" but go and do something else. The force of all their exhortations comes only from the example of their lives. "Follow my example, as I follow the example of Christ."
(5) Christian leaders are hard working. Finally, true Christian leaders are hard working. Jesus accomplished so much in his life that the apostle John once wondered if all the books in the world would be enough to record his works.
Are you a spiritual leader?!
In my own personal experience, spiritual leadership is rare, but since Christ is the head of the church, we expect to find him raising up all the leaders any local church needs. Our task is to constantly look out for the next generation of spiritual leaders. We can't make them, but we can recognise them.