I wanted to do a fluff post to add to my nation history for this but I couldn't be assed so here are the specifics to my cult and haunted by the past flaws. Also, do not question the gaping holes of my logic:

My current official history basically exalts St.Angela for uniting the lands and implementing a progressive and just society and system and all that jazz. Of course there are various interpretations for the faith and how you worship but by and large most is tolerated. Mostly. 

The actual events is that there were two Celestials that descended, Angela and her sister Esmerelda. It was actually the latter who did all of the work that Angela is credited with since Esmerelda was murdered and written out of history by Angela but evidence does exist of Esmerelda. It's not only the existence of Esmerelda but also the omission of Angela's less than savoury qualities that poses a threat. Her vanity and greed bankrupted an entire petty kingdom and broke the back of it's peasantry as they were basically enslaved to her desire, as well as killed as she flayed and scarred and outright murdered beautiful girls and women across the land as well as ignoring and causing famine. She was also a practitioner of blood magic to enhance and maintain her beauty, often taking baths in virgin blood a-la Elizabeth Bathory style because fuck it why not. 

(The whoring part I am not sure how to work with and am unsure whether it will be implemented or not. This is just one of the options im considering) 
The whoring part is also not widely known since while it is generally thought that the Celestines are Angela's descendants the official line is that they came in after her to maintain her works and all that, that they are not related to her by blood. The inbreeding is obviously known to the Celestines who practice it since they believe that their blood is pure and to lose it would lose the connection they have with Angela, thus weakening them. Some well connected High Men nobility are aware of this but generally keep silent because you dont question those who can damn you to hell both in this life and the next.

Those Men that do serve as aides and such are selected from a special class (the descendants of the once enslaved peasantry that served Angela) who are purposefully bred and indoctrinated for servitude to the Celestine rulers. They permanently live in the Celestine places of residence and are the most loyal of all their subjects not knowing the world outside. The wider populace know them simply as any other ordinary servants but the Celestines and a handful of High Men nobility know otherwise. 

There are certain parts of the Church, mostly the most secretive of Inquisitorial branches, which are aware of Esmerelda's existence and some of the history associated with her. This includes the fact that some branches of the Angelian family tree weren't originally Angellian to begin with as Esmerelda sired at least two children that Angela did not kill of with their mother.

Other strong evidence lies in the hands of the bones cult and within the remnants of the Old Kingdoms. Unexplored castles and ruins hide untouched books, art and other paraphernalia of that era that could be used as evidence to incriminate the Saint, the Church (on this topic, aside from the Inqusitorial branch mentioned above and a few well connected members, a large body of the church is unaware of all this) and the religion in general. 

The Bones Cult are the descendants of the necromancers who plagued the land during the Interregnum of the Old kingdoms era. They maintain a small but constant and dedicated membership using ghouls and other undead to pursue their cause of freedom. Their main thing is that they have Esmerelda as a lich Queen. She was aware of her sister's nature but never fully knew the extent with which Angela would go for attention, or her jealousy, but just in case she prepared a powerful but complex spell to preserve herself largely in tact in case she were to die. This involved an agreement with the necromancers to halt their brutal persecution. The result was that she did stay alive but the spell was never fully completed and now while as her soul resides in her partly decayed body, that body cannot move and she can do no action aside from telepathic communication. The Cult serves her purposes as their alliance still holds, they need her as living proof of Angela's actions and as a source of knowledge and she needs them to fix her body. However, intentionally or not, not much progress has been made in that department. 

The cult has also collected strong evidence of Angela's, and the Church's, origins from people who are well known (scholars, writers, kings etc...) from the Old Kingdoms period. There have been previous incidents where they spread this material without their name on it so it was taken as historical works without incrimination.