Hasn’t the overall influence of Christianity been negative?
A balanced response to this old question has been given by Kenneth Scott Latourette, Sterling Professor, Yale University:
Christianity has been the means of reducing more languages to writing than have all other factors combined. It has created more schools, more theories of education, and more systems than has any other one force. More than any other power in history it has impelled men to fight suffering, whether that suffering has come from disease, war or natural disasters. It has built thousands of hospitals, inspired the emergence of the nursing and medical professions, and furthered movement for public health and the relief and prevention of famine. Although explorations and conquests which were in part its outgrowth led to the enslavement of Africans for the plantations of the Americas, men and women whose consciences were awakened by Christianity and whose wills it nerved brought about the abolition of slavery (in England and America). Men and women similarly moved and sustained wrote into the laws of Spain and Portugal provisions to alleviate the ruthless exploitation of the Indians of the New World.
Wars have often been waged in the name of Christianity. They have attained their most colossal dimensions through weapons and large–scale organization initiated in (nominal) Christendom. Yet from no other source have there come as many and as strong movements to eliminate or regulate war and to ease the suffering brought by war. From its first centuries, the Christian faith has caused many of its adherents to be uneasy about war. It has led minorities to refuse to have any part in it. It has impelled others to seek to limit war by defining what, in their judgment, from the Christian standpoint is a "just war." In the turbulent Middle Ages of Europe it gave rise to the Truce of God and the Peace of God. In a later era it was the main impulse in the formulation of international law. But for it, the League of Nations and the United Nations would not have been. By its name and symbol, the most extensive organization ever created for the relief of the suffering caused by war, the Red Cross, bears witness to its Christian origin. The list might go on indefinitely. It includes many another humanitarian projects and movements, ideals in government, the reform of prisons and the emergence of criminology, great art and architecture, and outstanding literature.