By being the sole center of learning and scholarship in the European Dark Ages, by giving birth to the modern university, and by inventing musical notation? Ye

By being the sole center of learning and scholarship in the European Dark Ages, by giving birth to the modern university, and by inventing musical notation? Yes, I am aware of the bad things too. Reality has nuance. Edit: Now that I think about it, you are certainly right that the Catholic church has done more gross harm than Scientology, if only because it is much bigger and has been around for more than twenty times as long. However, I am not sure how the net harm stacks up, due to its central role in the founding of Western civilization, and other mitigating facts.