Yes, it always leave me perplexe when I hear someone say she make stupid choices and sleep with everyone... Well yes, if you make only this choices for her, she surely will...
What I was trying to intimate, was that the players choices are limited this early in the game. Myriam is what she is, at the start of the game. And part of what she is, has been created by Anthony's abuse. She makes stupid decisions not only because players choose it, but because Anthony has convinced her that she has to be that way, and because of a sheltered upbringing. She makes a lot of decisions because of who she already is, and not because of what players decide she is.
As far as the Priest is concerned. He tells her a load of nonsense, and she believes it, regardless of whether the player decides to allow her to have sex to get 'purified'. Regardless of what the player decides, she still acts like a bit of a bimbo, because she still swallows all the nonsense the Priest feeds her. And even if she doesn't succumb and get 'purified'. She still ends up feeling ashamed and worried that she might be possessed by demons.
And even when the player chooses to allow her to sucumb. Her belief in the nonsense the Priest is feeding her, is nothing to do with the players choices, but her own inherent naivety which stops her from questioning the priest's crazy concept of purification. I mean she could undertake the ritual and have at least some doubts about whether the priest was telling the truth. But no, she believes in it all totally. So it's that naivety which makes her a bit of a bimbo, and not necessarily the players choices. And understand, I'm not saying that she's a bimbo, only that she has elements of that kind of persona in her personality