The institution of atheism in the last century has lead to more death, suffering and misery than any other system of belief the world has ever known. Contrast the accomplishments and failures of Christianity with atheism. How many people perished in the nightmare of communism in Russia, China, Cambodia and elsewhere. Or the fascist regimes of Europe in the first half of this century. These regimes were avowed atheist, some even reaching back to their pagan roots to undermine the Church in their lands Yes, these regimes did try and institutionalize charities that their christian counterparts had pioneered. The result? Hospitals that began to eliminate those deemed "unworthy" of life. The brutal murder of the mentally ill, of those of a race deemed to be sub-human, and so on.
Good point, but it wasn't atheism that put these people under the knife it was another form of religion. Communism and/or socialism. And as far as Pagan roots go, Christianity has its roots planted firmly in the pagan past.