Everybody knows the Catholic Church never did anything worthwhile. (/sarcasm) The only thing people bring up about Roman Catholicism is it misuse by kings along with other leaders and the occasional horrible leadership from within. What the church as done has preserved art, literature, philosophy, history, traditions for two thousand years. It has been the worlds greatest educational system. It has given purpose for discovering the rest of the world (other than the other incentives like spices, exotic commerce, wealth and power). It has given comfort, spiritual direction and personal discipline to people worldwide. It has given us the Protestant Reformation. Probably most important but discounted by many, is giving people their ability to find their salvation .
Flame away, but in the words of Forrest Gump, "That's all I got to say about that."