I don't think it's Catholic bashing. I think it's history.
The Roman Catholic church was pretty corrupt at that time in history, and it has since then reformed itself.
That's human nature. We are sinful by nature and the institutions we run can be corrupted by our sin.
Just like the pedophilia and homosexual scandals lately in the Roman Catholic church, corruption does creep in to all institutions, and they all have to be swept clean from time to time.
The reformation was not a garden tea party. It killed 30% of the population of central Europe. Every leader involved, including the so-called "reformers", can be found in print urging that his opponents be exterminated in the name of God.