It sill trigger terrible internal division in the Church which, without some peculiar kind of prevention, will lead to a colossal bloodbath.
This is as bad a "proving" Satan and Judas were the "good guys" to Christians around 1600AD...what do folk think that would lead to, hm? A bloodbath as the division would be so extreme.
So unless some colossally powerful thing prevented it, this revelation will result in horrible loss of.life and extremism.
At the same time as that is the LAST thing the IC want such.
South Harcbong, Desnair and the Republic are headed into extremism and war, it's inevitable.
The Church is the only moderating factor, the last glue preventing horrible fracture and atrocity because the wahoos in the 2 Empires and Republic are filled by hate arrogance and stupidity...which never ends well.
Clyntahn's genocides left a stinking charnel breath that is a corrosive evil that takes generations to wash away.
At the moment it will help."prime the pump" for atrocities and gives a blueprint for how to successfully commit genocide. Just as Auschwitz has left a terrible effective design for every murderous lunatic in our history ever after

Currently, the Church leaders are trying to moderate things, this will throw napalm in the works, not just a spanner!
That is way out of the IC's usual very moral and ethical behaviour!
I can't see a plausible way for RFC to write a way to avoid horrific schism in the Church with this revelation *shrugs*?
Eventually necessary: yes.
But with the current decent into a world wide war...!?