The harm from the rights of a Kings investiture to the exclusion of clergy from all civil law are just two secular examples.
In religious practices you have a whole bunch of things that became doctrine and conveniently empowered the church. The claim that excommunication would damn the person. Purgatory is another great example. Even after your dead you better give the church money so some monks will pray for you otherwise you could be stuck in purgatory for a long time.
LOL. The gift that keeps on giving...