Assuming this is situated in a medieval-esque world with swords and magic. The magic well consumes magic power, which is naturally absorbed into living beings so they have regeneration. The amount of magic power poured into a 'spell' would correspond to how strong it is, a fireball created with 100 mana would be ten times stronger then a fireball created with 10 mana. The 'spell' acts as a medium to convert magic power to say creation of flames, a higher class spell like pyroblast would convert this better. There are for example spells that allow strengthening of the body and cancellation of noise and melting into the shadows. There is no mind magic so controlling people with magic is not possible.
All of the people believe in the church and their teachings. Now for some reason, I would like to destroy this church as their leaders are corrupted and how they teach that humans are supreme over the other races etc etc.
It is preferable that this does not end in bloodshed. Killing would only make the problem worse. The goddess can't do anything to help.
Now, how would one destroy the Church's influence and their followers faith in a year or less? How would I go around convincing a kingdom of a million humans that the Church is wrong?
I have read about this situation in some books but the only few solutions that ever came up was warring between the hero and church factions.
I don't know what tags to put btw