The trouble with the original proposition that Stephen was debating i.e. "Is the Catholic Church a force for good" is that it is a force for some good. But, of course, Hitler was a force for some good in as much as he rebuilt the German economy in the 30s but...

And the "but" factor really kicks in with the Catholic Church.
For example, my head was definitely screwed up by a Catholic education and their "hell fire" threats.
When I was 11, I was told by a teacher that if a I deliberately missed mass on Sunday, and was then knocked down and killed on Monday, my soul would go straight to hell!
Now, I would be interested to know if that would constitute child abuse today.