George Carey: Christians, stand up for your beliefs Yet far from being important and influential, in many parts of the world Christianity is weak and despised, and Christians are attacked and killed. In Nigeria, churches are firebombed; in Pakistan, churchgoers are prosecuted under draconian blasphemy laws, while in Egypt, they are either marginalised or assaulted. This is a reminder, if ever we needed one, that Christianity's uniqueness lies in its ambivalent relationship with power. Nelson Mandela once told me, after some of the shine of being his country's saviour had become a little tarnished by messy presidential politics, that the economic "apartheid" represented by wealth inequalities was a lot harder to confront than racism. Politics and the art of wielding power is rarely a simple choice between good and evil, as it was in the case of apartheid - it's usually a lot more messy than that. We are constantly faced with the question of where power lies in the business of everyday living. Power is sometimes measured by the wealth you have at your disposal, or by the number of people you employ. But there is also power in the ability to think of big ideas and then to have the ability to put them into action. If we were making up a story about a leader coming into power to save the world, I doubt very much you would have dreamt up the story of the birth of Jesus as it is recorded in the gospels of Matthew and Luke. Let us leave to one side the beguiling questions about the virgin birth, shepherds, angels and wise men and focus on the really interesting question of what it reveals about the nature of the Christian faith. Christianity's really unusual insight is into the use of power - or rather its lack of it, as we see in the life of Christ. This Christ forsook the path of the revolutionary zealot and rejected the role of both politician and jurist. Weakness and humility are the values chiefly in the foreground - although lurking in the background lies considerable power to redeem and change the world. At this time of the year some preachers exaggerate Jesus's lowly origins. He is described as a working-class lad from a poor town who made good. But the narrative suggests otherwise: that he came rather from a middle-class home. Yes, his birth in a stable must have been unpleasant, for his mother at least, but he was only born there because the customary hotels were full. Later we find the family could flee Herod's wrath by retreating to Egypt - the really poor could not have done that. It was when he was an adult that Jesus turned his back on comfortable living, embraced poverty and sought to speak up for the poor. Jesus made friends from among the poor - sinners, prostitutes, widows - and he regularly challenged the wealthy over their meanness and complacency. I cannot be the only Christian who has found this approach dominating our thinking this year. Indeed, the Church is at its best when it is following a Lord who is most at home with those in need. We began the year with two very significant new leaders. Installed respectively in the Vatican and Canterbury within days of each other, the Pope and Archbishop have had a profound impact already. Pope Francis, Time magazine's personality of the year, has made headlines not by his scholarship or even profound holiness - even though he is no fool and is certainly a holy man - but by his ability to identify with the people. He has cut through the clutter of ritual, robes and formality to embrace even those disfigured by tumours. And he has always spoken from the heart. He is increasingly seen as the Pope for the poor. Though the new Archbishop of Canterbury comes from a rather more privileged background, it is his varied life experiences that make a parallel with Pope Francis possible. This is a church leader who has worked in the City and has been intimately involved in the thorny and urgent question of banking reform. He has shown a breathtaking ability to challenge the rich and powerful and to speak for those in need. He has also negotiated with terrorists and defended persecuted Christians. Both Archbishop Welby and Pope Francis are men who have rightly earned the respect and admiration of many. Of course, there are so many others doing work that is hidden from view. Canon Andrew White is perhaps the Church of England's best export - working in Baghdad among Christians and Muslims, where he is respected by Sunni and Shiite leaders alike. He has put up with death threats from Islamists who would like nothing better than to ethnically cleanse the Christian community, one of the most ancient of Christian congregations. Closer to home, I admit I am worried about the future of faith in the West. Many Christians I meet say there is a pressure on them to be silent about their faith. Though there can be no question of a comparison with the powerlessness and weakness of the Church in the Middle East, there is an increasing timidity on the part of churchgoers in the West - about even admitting that they have a faith in the workplace. Just a week ago, an American, learning that I was going to write this Christmas message, said teasingly: "I hope you will mention the name of Jesus!" Well, that is what Christmas is all about and I cannot but speak his name. He is Christmas. It is in his name that we give to one another and it is because of his name that the Christian Churches in all their weakness may regain the strength to become strong once more. True power lies in how we use it on behalf of others.This is the meaning of Christmas. And I wish all Telegraph readers a very happy Christmas. Lord Carey was Archbishop of Canterbury, 1991-2002