Girl, they have healings powers obviously they need a source for where their healing powers is. I'm an atheist but I'm not this brain dead. If I read a novel that has obviously hinted a million times to pray for a healing power to work because saintess actually get blessed by whoever they worship should have clicked in your brain that this is how the story in the novel works.
No need to get mad bestie lol. I have seen this premise before but I haven't seen it introduced so point blank in other stories so I was surprised. Usually they introduce it gradually with a spin that it was their own inner power or they r related to the goddess or some shit. It's not that deep lol.
Kinda wild that the way to unlock her power was to "belief in God" but ig u gotta do what u gotta do. Also kinda wack to then still believe in said religion after finding out that the world is a novel but ig it might make sense later?